Features:Few things are as captivating as an orrery. First, the craftsmanship required to build this remarkable mechanical model is of the highest order. And like a globe, an orrery also serves a practical function. It shows you the relative positions of the planets in the solar system during a given year and month，Mercury, Venus (Venus will rotate retrograde), Earth, Mars, Jupiter, etc. all revolve around the sun at different speeds according to specific physical laws.Design and build custom brass orreries from scratch. The artwork is of such exceptional quality that it shines with pure gold.The base of the orrery is 10 in diameter. The height of the orrery is approximately 19. The center of Pluto will span to approximate 18 plus Pluto's moons so the total reach would be closer to 20". The Sun is turned from brass bar. The Earth is ink printed onto sandstone (I have these made for me) and the planets are painted wooden spheres.