Earth, Moon, and Sun direction mechanical orrery (V1)

thingiverse

<a href="https://i.imgur.com/fRrlIRZ.mp4">Watch an animation of it in action here!</a> This desktop orrery accurately simulates several elements of the Earth, Moon, Sun system. More specifically: - For every 27.43 rotations of the Earth, the Moon completes one rotation - The Earth is properly inclined at a ~23° angle - The scale of the Earth (at 6cm) and of the Moon (at 1.5 cm) is accurate - For every year, the Sun-direction indicator completes one full revolution (indicated by red arrow) - The Earth, Moon, and Sun all rotate/revolve in the proper direction The gears used are 10T, 14T, 60T, and 64T along with a three miter gears, and a 1T gear driving an 80T gear to indicate the sun direction. Additionally, there's a one-to-one rubber band link required to drive the Earth.