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Elementary Planetarium
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…
Item: U49683
$ 166.00
Trippensee Planetarium, Original
…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…
Item: U49681
$ 414.00
