Hand-Crank Geared Orrery - Solar System Gear Model, Planets and Moon at True Periods, No Supports

A brass-style desktop orrery with a real gear train. Turn the crank on the deck and Mercury, Venus, Earth and Mars orbit the Sun at their true relative speeds, while the Moon circles the Earth once every sidereal month. The model is about 255 mm across the outermost orbit and 162 mm tall. It stands on a stepped black base with a brass gear cage: you can see the gears turning through 21 pointed windows. On the deck there is an ivory compass rose and an ivory calendar ring with black month names,…

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