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      • Astronomy, space & time

        Zonnestelselmodel (Solar System Scale Model) 1:100 billion (Dutch)

        The perfect tool to learn all about our Solar System

        by Rob Walrecht

        This unique product is both a scale model and concise encyclopaedia of the Solar System in one! It consists of sixteen information-packed cards (10x12 cm or 4x5 inch), all pertaining to the Sun, the planets, the Moon, asteroids, comets and the new class to which Pluto now belongs, the dwarf planets. These cards are a quick way to learn all there is to know about these objects, as well as being ideal for youngsters, papers and talks! Primarily, however, it is an exquisite scale model (scale 1:100 billion) of our fascinating Solar System, presenting the best possible representation of the distances within our Solar System as well as the unimaginable emptiness of the universe. In this scale model, the Sun is the size of a marble (14 mm), Jupiter, which is at 8 m/26 ft from the Sun, as large as a plastic pin-head, the Earth (at 1.5 m/5 ft) as large a  grain of coarse sand, Mars (at 2.3 m/7.5 ft) as large a grain of fine sand and Pluto, which would now be at 47 m/155 ft from the Sun, as large as a dust particle... The scale model, when completely placed, is 64 m (210 ft) long. The closest next star is at 400 km (250 miles) from the Sun! The cards show the sizes of the Heavenly bodies at scale, as well as these sizes one hundred times ‘enlarged’, for better comparison of the members of our Solar System. Special standards to place them are included and the cards contain holes to be hung on the wall or from sticks. Available are an English version (with metric units), a US version (with inches, miles, Fahrenheit etc.) and a Dutch version.

      • Astronomy, space & time

        PLN-50 – Planisphere for 50° North latitude

        The perfect way to learn how to recognise the stars and constellations, very accurate between 45° and 55° north latitude

        by Rob Walrecht

        A Planisphere or ‘Star Wheel’ is the perfect way to learn how to recognise the stars and constellations. It consists of a star chart showing all stars and constellations that are visible from a certain area (latitude). However, stars rise and set and the Night Sky changes from season to season. Therefore a second disc is placed on top of the star chart, containing a ‘horizon’ that defines the visible part of the sky at any given moment, which is naturally half of the total starry sky. That moment can be set at the desired date and time. Rob Walrecht’s planisphere design is very modern and attractive. His planispheres are among the best in the world. His programme is the most extensive in the world, with English planispheres for the entire populated world, and planispheres in thirteen other languages (in 2013). The basic star chart contains some 700 stars and 300 ‘objects for binoculars’: galaxies, nebulae, open and globular clusters, double and variable stars that can be seen with the naked eye or at least with binoculars. This is an English planisphere for 60° north, perfect anywhere between 55° and 65° north. It is a round planisphere, 25 cm in diameter, with instructions and a few interesting tips on the backside. For use in for instance: North Canada, Iceland, Northern Europe and Northern Russia. Rob Walrecht Productions is specialised in customised planispheres, so you can have one for any latitude zone, in any language, in any size, shape and colours, and in any design.

      • Astronomy, space & time

        PLN-50NL - Dutch Holiday Planisphere for 50° north

        The perfect way to learn how to recognise the stars and constellations, very accurate between 45° and 55° north latitude

        by Rob Walrecht

        A Planisphere or ‘Star Wheel’ is the perfect way to learn how to recognise the stars and constellations. It consists of a star chart showing all stars and constellations that are visible from a certain area (latitude). However, stars rise and set and the Night Sky changes from season to season. Therefore a second disc is placed on top of the star chart, containing a ‘horizon’ that defines the visible part of the sky at any given moment, which is naturally half of the total starry sky. That moment can be set at the desired date and time. Rob Walrecht’s planisphere design is very modern and attractive. His planispheres are among the best in the world. His programme is the most extensive in the world, with English planispheres for the entire populated world, and planispheres in thirteen other languages (in 2013). The basic star chart contains some 700 stars and 300 ‘objects for binoculars’: galaxies, nebulae, open and globular clusters, double and variable stars that can be seen with the naked eye or at least with binoculars. This is an English planisphere for 50° north, perfect anywhere between 45° and 55° north. It is a round planisphere, 25 cm in diameter, with instructions and a few interesting tips on the backside. For use in for instance: Northern USA, Southern Canada, Central Europe and Central Asia. Rob Walrecht Productions is specialised in customised planispheres, so you can have one for any latitude zone, in any language, in any size, shape and colours, and in any design.

      • Astronomy, space & time

        PLN-NL – Dutch Planisfeer voor 52° noord

        The perfect way to learn how to recognise the stars and constellations, very accurate between 47° and 57° north latitude

        by Rob Walrecht

        A Planisphere or ‘Star Wheel’ is the perfect way to learn how to recognise the stars and constellations. It consists of a star chart showing all stars and constellations that are visible from a certain area (latitude). However, stars rise and set and the Night Sky changes from season to season. Therefore a second disc is placed on top of the star chart, containing a ‘horizon’ that defines the visible part of the sky at any given moment, which is naturally half of the total starry sky. That moment can be set at the desired date and time. Rob Walrecht’s planisphere design is very modern and attractive. His planispheres are among the best in the world. His programme is the most extensive in the world, with English planispheres for the entire populated world, and planispheres in thirteen other languages (in 2013). The basic star chart contains some 700 stars and 300 ‘objects for binoculars’: galaxies, nebulae, open and globular clusters, double and variable stars that can be seen with the naked eye or at least with binoculars. This is a Dutch language planisphere for 52° north, perfect anywhere between 47° and 57° north, so perfect for the Netherlands and Belgium. It is a square design, 25 x 25 cm, folded and with four pages: one with the star chart/upper disc, one with instructions and a few interesting tips and two (the inside pages) containing a concise introduction to astronomy. For use in for instance: Central European latitudes, Northern USA, Southern Canada and Central Asia. Rob Walrecht Productions is specialised in customised planispheres, so you can have one for any latitude zone, in any language, in any size, shape and colours, and in any design.

      • Astronomy, space & time

        PLN-30 – Planisphere for 30° North latitude

        The perfect way to learn how to recognise the stars and constellations, very accurate between 25° and 35° north latitude

        by Rob Walrecht

        A Planisphere or ‘Star Wheel’ is the perfect way to learn how to recognise the stars and constellations. It consists of a star chart showing all stars and constellations that are visible from a certain area (latitude). However, stars rise and set and the Night Sky changes from season to season. Therefore a second disc is placed on top of the star chart, containing a ‘horizon’ that defines the visible part of the sky at any given moment, which is naturally half of the total starry sky. That moment can be set at the desired date and time. Rob Walrecht’s planisphere design is very modern and attractive. His planispheres are among the best in the world. His programme is the most extensive in the world, with English planispheres for the entire populated world, and planispheres in thirteen other languages (in 2013). The basic star chart contains some 700 stars and 300 ‘objects for binoculars’: galaxies, nebulae, open and globular clusters, double and variable stars that can be seen with the naked eye or at least with binoculars. This is an English planisphere for 30° north, perfect anywhere between 25° and 35° north. It is a round planisphere, 25 cm in diameter, with instructions and a few interesting tips on the backside. For use in for instance: Southern USA, North Africa, Middle East, North India, South China and South Japan. Rob Walrecht Productions is specialised in customised planispheres, so you can have one for any latitude zone, in any language, in any size, shape and colours, and in any design.

      • Astronomy, space & time

        PLN-50D – German Planisphäre für 50° Nord

        The perfect way to learn how to recognise the stars and constellations, very accurate between 45° and 55° north latitude

        by Rob Walrecht

        A Planisphere or ‘Star Wheel’ is the perfect way to learn how to recognise the stars and constellations. It consists of a star chart showing all stars and constellations that are visible from a certain area (latitude). However, stars rise and set and the Night Sky changes from season to season. Therefore a second disc is placed on top of the star chart, containing a ‘horizon’ that defines the visible part of the sky at any given moment, which is naturally half of the total starry sky. That moment can be set at the desired date and time. Rob Walrecht’s planisphere design is very modern and attractive. His planispheres are among the best in the world. His programme is the most extensive in the world, with English planispheres for the entire populated world, and planispheres in thirteen other languages (in 2013). The basic star chart contains some 700 stars and 300 ‘objects for binoculars’: galaxies, nebulae, open and globular clusters, double and variable stars that can be seen with the naked eye or at least with binoculars. This is a German language planisphere for 50° north, perfect anywhere between 45° and 55° north, so perfect for the German speaking countries in Europe. It is a round planisphere, 25 cm in diameter, with instructions and a few interesting tips on the backside. For use in for instance: Central European latitudes, Northern USA, Southern Canada and Central Asia. Rob Walrecht Productions is specialised in customised planispheres, so you can have one for any latitude zone, in any language, in any size, shape and colours, and in any design.

      • Astronomy, space & time

        PLN-EQR – Planisphere for the Equator area

        The perfect way to learn how to recognise the stars and constellations, very accurate between 15° north and 15° south latitude

        by Rob Walrecht

        A Planisphere or ‘Star Wheel’ is the perfect way to learn how to recognise the stars and constellations. It consists of a star chart showing all stars and constellations that are visible from a certain area (latitude). However, stars rise and set and the Night Sky changes from season to season. Therefore a second disc is placed on top of the star chart, containing a ‘horizon’ that defines the visible part of the sky at any given moment, which is naturally half of the total starry sky. That moment can be set at the desired date and time. Rob Walrecht’s planisphere design is very modern and attractive. His planispheres are among the best in the world. His programme is the most extensive in the world, with English planispheres for the entire populated world, and planispheres in thirteen other languages (in 2013). The basic star chart contains some 700 stars and 300 ‘objects for binoculars’: galaxies, nebulae, open and globular clusters, double and variable stars that can be seen with the naked eye or at least with binoculars. This is an English double planisphere, for 10° north and 10° south, perfect anywhere between 15° north and 15° south. It is a square planisphere, 25 x 25 cm, with four pages. Two of these pages carry the star charts and upper discs, a third a concise introduction to astronomy and the fourth (back) page the instructions and a few interesting tips. For use in for instance: Brazil, northern South America, Central Africa, South India, Sri Lanka, Indonesia and southern Indochina. Rob Walrecht Productions is specialised in customised planispheres, so you can have one for any latitude zone, in any language, in any size, shape and colours, and in any design.

      • Astronomy, space & time

        PLN-S30Sp – Spanish Planisphere for 30° south

        The perfect way to learn how to recognise the stars and constellations, very accurate between 25° and 35° south latitude

        by Rob Walrecht

        A Planisphere or ‘Star Wheel’ is the perfect way to learn how to recognise the stars and constellations. It consists of a star chart showing all stars and constellations that are visible from a certain area (latitude). However, stars rise and set and the Night Sky changes from season to season. Therefore a second disc is placed on top of the star chart, containing a ‘horizon’ that defines the visible part of the sky at any given moment, which is naturally half of the total starry sky. That moment can be set at the desired date and time. Rob Walrecht’s planisphere design is very modern and attractive. His planispheres are among the best in the world. His programme is the most extensive in the world, with English planispheres for the entire populated world, and planispheres in thirteen other languages (in 2013). The basic star chart contains some 700 stars and 300 ‘objects for binoculars’: galaxies, nebulae, open and globular clusters, double and variable stars that can be seen with the naked eye or at least with binoculars. This is an Spanish planisphere for 30° south, perfect anywhere between 25° and 35° south, so covering most of South America. It is a round planisphere, 25 cm in diameter, with instructions and a few interesting tips on the backside. For use in for instance: Central South America, South Africa and Central (most of) Australia. Rob Walrecht Productions is specialised in customised planispheres, so you can have one for any latitude zone, in any language, in any size, shape and colours, and in any design.

      • Astronomy, space & time

        PLN-40Sp – Spanish Planisphere for 40° north

        The perfect way to learn how to recognise the stars and constellations, very accurate between 35° and 45° north latitude

        by Rob Walrecht

        A Planisphere or ‘Star Wheel’ is the perfect way to learn how to recognise the stars and constellations. It consists of a star chart showing all stars and constellations that are visible from a certain area (latitude). However, stars rise and set and the Night Sky changes from season to season. Therefore a second disc is placed on top of the star chart, containing a ‘horizon’ that defines the visible part of the sky at any given moment, which is naturally half of the total starry sky. That moment can be set at the desired date and time. Rob Walrecht’s planisphere design is very modern and attractive. His planispheres are among the best in the world. His programme is the most extensive in the world, with English planispheres for the entire populated world, and planispheres in thirteen other languages (in 2013). The basic star chart contains some 700 stars and 300 ‘objects for binoculars’: galaxies, nebulae, open and globular clusters, double and variable stars that can be seen with the naked eye or at least with binoculars. This is a Spanish language planisphere for 40° north, perfect anywhere between 35° and 45° north, so perfect for Spain and the USA. It is a round planisphere, 25 cm in diameter, with instructions and a few interesting tips on the backside. For use in for instance: Southern Europe, Central USA, Central China, North Japan and Korea. Rob Walrecht Productions is specialised in customised planispheres, so you can have one for any latitude zone, in any language, in any size, shape and colours, and in any design.

      • Astronomy, space & time

        Solar System Scale Model 1:100 billion (US edition)

        The perfect tool to learn all about our Solar System

        by Rob Walrecht

        This unique product is both a scale model and concise encyclopaedia of the Solar System in one! It consists of sixteen information-packed cards (10x12 cm or 4x5 inch), all pertaining to the Sun, the planets, the Moon, asteroids, comets and the new class to which Pluto now belongs, the dwarf planets. These cards are a quick way to learn all there is to know about these objects, as well as being ideal for youngsters, papers and talks! Primarily, however, it is an exquisite scale model (scale 1:100 billion) of our fascinating Solar System, presenting the best possible representation of the distances within our Solar System as well as the unimaginable emptiness of the universe. This version is made for US customers, as the units used are inches, miles, Fahrenheit etc. In this scale model, the Sun is the size of a marble (14 mm), Jupiter, which is at 8 m/26 ft from the Sun, as large as a plastic pin-head, the Earth (at 1.5 m/5 ft) as large a  grain of coarse sand, Mars (at 2.3 m/7.5 ft) as large a grain of fine sand and Pluto, which would now be at 47 m/155 ft from the Sun, as large as a dust particle... The scale model, when completely placed, is 64 m (210 ft) long. The closest next star is at 400 km (250 miles) from the Sun! The cards show the sizes of the Heavenly bodies at scale, as well as these sizes one hundred times ‘enlarged’, for better comparison of the members of our Solar System. Special standards to place them are included and the cards contain holes to be hung on the wall or from sticks. Available are an English version (with metric units), a US version (with inches, miles, Fahrenheit etc.) and a Dutch version.

      • Astronomy, space & time

        Solar System Scale Model 1:100 billion (metric)

        The perfect tool to learn all about our Solar System

        by Rob Walrecht

        The perfect tool to learn all about our Solar System This unique product is both a scale model and concise encyclopaedia of the Solar System in one! It consists of sixteen information-packed cards (10x12 cm or 4x5 inch), all pertaining to the Sun, the planets, the Moon, asteroids, comets and the new class to which Pluto now belongs, the dwarf planets. These cards are a quick way to learn all there is to know about these objects, as well as being ideal for youngsters, papers and talks! Primarily, however, it is an exquisite scale model (scale 1:100 billion) of our fascinating Solar System, presenting the best possible representation of the distances within our Solar System as well as the unimaginable emptiness of the universe. In this scale model, the Sun is the size of a marble (14 mm), Jupiter, which is at 8 m/26 ft from the Sun, as large as a plastic pin-head, the Earth (at 1.5 m/5 ft) as large a  grain of coarse sand, Mars (at 2.3 m/7.5 ft) as large a grain of fine sand and Pluto, which would now be at 47 m/155 ft from the Sun, as large as a dust particle... The scale model, when completely placed, is 64 m (210 ft) long. The closest next star is at 400 km (250 miles) from the Sun! The cards show the sizes of the Heavenly bodies at scale, as well as these sizes one hundred times ‘enlarged’, for better comparison of the members of our Solar System. Special standards to place them are included and the cards contain holes to be hung on the wall or from sticks. Available are an English version (with metric units), a US version (with inches, miles, Fahrenheit etc.) and a Dutch version.

      • Astronomy, space & time

        Astroset 'Sterrenkunde is fun!'

        A set of three wonderful astronomical instruments for youngsters

        by Rob Walrecht

        This is a special set made for youngsters, and consisting of three products: the Solar System Scale Model (scale 1:100 billion), the build-it-yourself Star Wheel and the BIY Sundial. The Solar System Scale Model is a ready made product; the two BIY products are made of high quality 400 gram cardboard. It is a very instructive set, consisting of three veru special products.

      • Astronomy, space & time

        Planisphere for 60° north

        The perfect way to learn how to recognise the stars and constellations, very accurate between 55° and 65° North latitude

        by Rob Walrecht

        A Planisphere or ‘Star Wheel’ is the perfect way to learn how to recognise the stars and constellations. It consists of a star chart showing all stars and constellations that are visible from a certain area (latitude). However, stars rise and set and the Night Sky changes from season to season. Therefore a second disc is placed on top of the star chart, containing a ‘horizon’ that defines the visible part of the sky at any given moment, which is naturally half of the total starry sky. That moment can be set at the desired date and time. Rob Walrecht’s planisphere design is very modern and attractive. His planispheres are among the best in the world. His programme is the most extensive in the world, with English planispheres for the entire populated world, and planispheres in thirteen other languages (in 2013). The basic star chart contains some 700 stars and 300 ‘objects for binoculars’: galaxies, nebulae, open and globular clusters, double and variable stars that can be seen with the naked eye or at least with binoculars. This is an English planisphere for 60° north, perfect anywhere between 55° and 65° North. It is a round planisphere, 25 cm in diameter, with instructions and a few interesting tips on the backside. For use in for instance: North Canada, Iceland, Northern Europe and Northern Russia. Rob Walrecht Productions is specialised in customised planispheres, so you can have one for any latitude zone, in any language, in any size, shape and colours, and in any design.

      • Astronomy, space & time

        PLN-40 – Planisphere for 40° North latitude

        The perfect way to learn how to recognise the stars and constellations, very accurate between 35° and 45° north latitude

        by Rob Walrecht

        A Planisphere or ‘Star Wheel’ is the perfect way to learn how to recognise the stars and constellations. It consists of a star chart showing all stars and constellations that are visible from a certain area (latitude). However, stars rise and set and the Night Sky changes from season to season. Therefore a second disc is placed on top of the star chart, containing a ‘horizon’ that defines the visible part of the sky at any given moment, which is naturally half of the total starry sky. That moment can be set at the desired date and time. Rob Walrecht’s planisphere design is very modern and attractive. His planispheres are among the best in the world. His programme is the most extensive in the world, with English planispheres for the entire populated world, and planispheres in thirteen other languages (in 2013). The basic star chart contains some 700 stars and 300 ‘objects for binoculars’: galaxies, nebulae, open and globular clusters, double and variable stars that can be seen with the naked eye or at least with binoculars. This is an English planisphere for 40° north, perfect anywhere between 35° and 45° north. It is a round planisphere, 25 cm in diameter, with instructions and a few interesting tips on the backside. For use in for instance: Central USA, Southern Europe, Central China, North Japan and Korea. Rob Walrecht Productions is specialised in customised planispheres, so you can have one for any latitude zone, in any language, in any size, shape and colours, and in any design.

      • Astronomy, space & time

        PLN-47F – French Planisphère pour 47° nord

        The perfect way to learn how to recognise the stars and constellations, very accurate between 42° and 52° north latitude

        by Rob Walrecht

        A Planisphere or ‘Star Wheel’ is the perfect way to learn how to recognise the stars and constellations. It consists of a star chart showing all stars and constellations that are visible from a certain area (latitude). However, stars rise and set and the Night Sky changes from season to season. Therefore a second disc is placed on top of the star chart, containing a ‘horizon’ that defines the visible part of the sky at any given moment, which is naturally half of the total starry sky. That moment can be set at the desired date and time. Rob Walrecht’s planisphere design is very modern and attractive. His planispheres are among the best in the world. His programme is the most extensive in the world, with English planispheres for the entire populated world, and planispheres in thirteen other languages (in 2013). The basic star chart contains some 700 stars and 300 ‘objects for binoculars’: galaxies, nebulae, open and globular clusters, double and variable stars that can be seen with the naked eye or at least with binoculars. This is a French language planisphere for 47° north, perfect anywhere between 42° and 52° north, so perfect for France, Belgium and Switzerland. It is a round planisphere, 25 cm in diameter, with instructions and a few interesting tips on the backside. For use in for instance: Central European latitudes, Northern USA, Southern Canada and Central Asia. Rob Walrecht Productions is specialised in customised planispheres, so you can have one for any latitude zone, in any language, in any size, shape and colours, and in any design.

      • Astronomy, space & time

        PLN-60NL - Dutch Holiday Planisphere for 60° north

        The perfect way to learn how to recognise the stars and constellations, very accurate between 55° and 65° north latitude

        by Rob Walrecht

        A Planisphere or ‘Star Wheel’ is the perfect way to learn how to recognise the stars and constellations. It consists of a star chart showing all stars and constellations that are visible from a certain area (latitude). However, stars rise and set and the Night Sky changes from season to season. Therefore a second disc is placed on top of the star chart, containing a ‘horizon’ that defines the visible part of the sky at any given moment, which is naturally half of the total starry sky. That moment can be set at the desired date and time. Rob Walrecht’s planisphere design is very modern and attractive. His planispheres are among the best in the world. His programme is the most extensive in the world, with English planispheres for the entire populated world, and planispheres in thirteen other languages (in 2013). The basic star chart contains some 700 stars and 300 ‘objects for binoculars’: galaxies, nebulae, open and globular clusters, double and variable stars that can be seen with the naked eye or at least with binoculars. This is an English planisphere for 60° north, perfect anywhere between 55° and 65° north. It is a round planisphere, 25 cm in diameter, with instructions and a few interesting tips on the backside. For use in for instance: North Canada, Iceland, Northern Europe and Northern Russia. Rob Walrecht Productions is specialised in customised planispheres, so you can have one for any latitude zone, in any language, in any size, shape and colours, and in any design.

      • Astronomy, space & time
        July 2013

        Astronomy Posters

        Set of 6 posters about astronomy

        by Rob Walrecht

        The many illustrations in the three astronomy books of our 'Enjoying Astronomy' series are a real treasure and were used to publish a set of six astronomy posters (for now in Dutch only). The posters are coupled to the books: 2 posters made from illustrations of one book. The posters are: 1a. Alles beweegt! De bewegingen van Zon en Maan (Everything moves! The movements of the Sun and Moon). It is an overview of the major celestial movements, causing the ‘day’, the ýear’, the seasons, the phases of the Moon, eclipses and more. Size 50 x 70 cm. 1b. The Stars. Everything about stars: their sizes, colours and temperatures, brightness and more. . Size 50 x 70 cm. 2a. Overview of the Solar System. The Solar System in five steps, with the Inner Solar System (up to the Asteroid Belt; the Outer Solar System (the realm of the giant planets); the Kuiper Belt, the Inner Oort Cloud to the Outer Oort Cloud. Size 50 x 70 cm. 2b. The members of the Solar System; comparisons of groups of Solar System objects: the rocky planets, giants, dwarf planets (and candidate dwarf planets!) and satellites (‘moons’). Also a large ‘familie portrait’ with all the members of the Solar System of 1000 km diameter and larger. Finally the Solar System to scale (up to Neptune). Size 50 x 70 cm. 3a – The Universe. An overview of the Universe, in nine step, from the Inner Solar System to a distance of 1 billion light-years and then to the complete Universe. Size 45 x 95 cm, portrait. 3b. Radiation from the Universe. A complete Electromagnetic Spectrum, almost 1 metre wide.  Also contains a lot of interesting information about the astronomical importance of different wavelengths, with pictures of the great galaxy M 81 (Ursa Major) in radio wavelengths, infrared, visible light, UV, X-rays, gamma rays and combinations. Size 45 x 95 cm, landscape.

      • Astronomy, space & time
        July 2013

        STW-NL – Build-It-Yourself Star Wheel for Holland and Belgium

        The perfect way for youngsters to learn how to recognise the stars and constellations

        by Rob Walrecht

        A Star Wheel (or Planisphere) is the perfect way to learn how to recognise the stars and constellations. It consists of a star chart showing all stars and constellations that are visible from a certain area (latitude). However, stars rise and set and the Night Sky changes from season to season. Therefore a second disc is placed on top of the star chart, containing a ‘horizon’ that defines the visible part of the sky at any given moment, which is naturally half of the total starry sky. That moment can be set at the desired date and time. Rob Walrecht’s BIY Star Wheel was designed for ages up to 15 years, in 1985. Since 2002 there are also English designs for 40° and 50° north. The current Dutch design is the most modern of the three and in fact the colours used in the star chart will be the future standard colours for the Planispheres. The star chart is basically the same as that of our planispheres (so as accurate!), although with less ‘objects for binoculars’ (galaxies, nebulae, open and globular clusters, double and variable stars that can be seen with the naked eye or at least with binoculars). This is to not make it too complicated for young people. Also and for the same reason, the right ascension/declination features are omitted. The Star Wheel is provided on a sheet of 400 g cardboard, size 42 x 30 cm (A3), printed on one side, and with a folding line to fold it to size 21 x 30 cm (A4). However, we can make any required design, for any latitude zone, in any language, in any size, shape and colours, and in any design.

      • Astronomy, space & time
        July 2013

        STW-NL – Build-It-Yourself Star Wheel for 50° north

        The perfect way for youngsters to learn how to recognise the stars and constellations

        by Rob Walrecht

        A Star Wheel (or Planisphere) is the perfect way to learn how to recognise the stars and constellations. It consists of a star chart showing all stars and constellations that are visible from a certain area (latitude). However, stars rise and set and the Night Sky changes from season to season. Therefore a second disc is placed on top of the star chart, containing a ‘horizon’ that defines the visible part of the sky at any given moment, which is naturally half of the total starry sky. That moment can be set at the desired date and time. Rob Walrecht’s BIY Star Wheel was designed for ages up to 15 years, in 1985. Since 2002 there are also English designs for 40° and 50° north. The current Dutch design is the most modern of the three and in fact the colours used in the star chart will be the future standard colours for the Planispheres. The star chart is basically the same as that of our planispheres (so as accurate!), although with less ‘objects for binoculars’ (galaxies, nebulae, open and globular clusters, double and variable stars that can be seen with the naked eye or at least with binoculars). This is to not make it too complicated for young people. Also and for the same reason, the right ascension/declination features are omitted. This Star Wheel is designed for 50° north latitude, and can be used between roughly 40° and 60° north. This means in most of Europe and North America. The Star Wheel is provided on a sheet of 400 g cardboard, size 42 x 30 cm (A3), printed on one side, and with a folding line to fold it to size 21 x 30 cm (A4). However, we can make any required design, for any latitude zone, in any language, in any size, shape and colours, and in any design.

      • Astronomy, space & time
        July 2013

        STW-NL – Build-It-Yourself Star Wheel for 40° north

        The perfect way for youngsters to learn how to recognise the stars and constellations

        by Rob Walrecht

        A Star Wheel (or Planisphere) is the perfect way to learn how to recognise the stars and constellations. It consists of a star chart showing all stars and constellations that are visible from a certain area (latitude). However, stars rise and set and the Night Sky changes from season to season. Therefore a second disc is placed on top of the star chart, containing a ‘horizon’ that defines the visible part of the sky at any given moment, which is naturally half of the total starry sky. That moment can be set at the desired date and time. Rob Walrecht’s BIY Star Wheel was designed for ages up to 15 years, in 1985. Since 2002 there are also English designs for 40° and 50° north. The current Dutch design is the most modern of the three and in fact the colours used in the star chart will be the future standard colours for the Planispheres. The star chart is basically the same as that of our planispheres (so as accurate!), although with less ‘objects for binoculars’ (galaxies, nebulae, open and globular clusters, double and variable stars that can be seen with the naked eye or at least with binoculars). This is to not make it too complicated for young people. Also and for the same reason, the right ascension/declination features are omitted. The Star Wheel is provided on a sheet of 400 g cardboard, size 42 x 30 cm (A3), printed on one side, and with a folding line to fold it to size 21 x 30 cm (A4). However, we can make any required design, for any latitude zone, in any language, in any size, shape and colours, and in any design. This Star Wheel is designed for 40° north latitude, and can be used between roughly 30° and 50° north. This means in central and southern Europe, North Africa and the USA.

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