The principle is almost exactly the same as a watch or clock, but instead of three concentric axles, you need 9 for the planets.
Have a google for Orrery kit - there are loads available. It is really all simple maths - you just need to know relative orbital periods in order to calculate cog sizes.
(picture from curiousminds.co.uk)
For moons, you do add a little complexity in the form of a transmission to support the Earth, so that the difference in movement can move the Moon.
No comments:
Post a Comment