Make a Tellurion (sun-earth-moon Orrery) for Your Kid

A tellurion is a module for simulating the movement of earth and moon. This kind of module can be found in museum, but seldom seen in market. Some simplified version of tellurion can be found on internet, however a complete (almost) tellurion module was seldom made by DIYers. In this manual, I will ...
By: HuidongT

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