Helios Planetarium/Orrery Earth-centred model and accessories
by Helios
This stunning fully electric model, shows the planets orbiting the sun at their correct relative speed. It also includes a star dome, showing how the stars and constellations have fixed positions in space, whilst the planets orbit the sun.The orrery can have all its planets displayed, or just one or two. The planets can be positioned for any year or month up to 2020. The speed and direction of rotation can be changed. An amazing way of learning about the planets in their orbits, about the Moon and its phases, about the stars and constellations, and about eclipses and solar, sidereal and GMT time. Includes comprehensive instruction and activity booklet.
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