Light and Optics : Astronomy
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The Trippensee® planetarium and the motorized Trippensee® planetarium are orreries that perform the same functions; the difference being that the motorized model contains a spring wire connection to the red arm which moves the planetarium arm to revolve the Earth, moon, and Venus balls around the sun. These planetariums are durable ...
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The Elementary® planetarium (orreries) is a perfect beginning model to illustrate individual concepts, one at a time. In this model, the Earth and moon are moved separately, by hand. The ladder-chain-and-gear drive keep the axis of the Earth pointed at a 23- 1/2° angle, toward the North Star. An instruction book, Elementary Planetariums,...
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