The Elementary® planetariums
(orreries) are available as lighted models (M-M20), or unlighted (M-M10) models.
These planetariums are suggested for use as a beginning model, and show
individual concepts, one at a time. In this model, the Earth and Moon are moved
by hand. The ladder chain and gear drive is used solely to keep the axis of the
Earth pointed at a 23-1/2° angle, toward the North Star. A few of the
many concepts that can be demonstrated with this model are: The reason for the
occurrence of night and day. The variation in the length of daylight.
The movement of the Earth around the sun from west to east. Why only
one side of the moon is seen from the Earth. How eclipses of the sun and moon
occur. Cause of the phases of the moon. These are but a few of the many basic
phenomena which can be explained and demonstrated with either of these
elementary astronomy models. An instruction book, Elementary
Planetariums, is included.
Special Note: Earth may have
dark blue or black ocean.
- Height: 12"
- Sun: 5 3/4"
- Earth: 4"
- Shipping Weight M-M20- 6 lbs, M-M10 - 5 lbs.
Portable desktop Planetariums have been
produced for over 90 years by Trippensee. They provide many visual demonstrations that
clarify the relationships of the solar system elements in
motion, for children and adults interested in learning more about the
universe around them. Perfect for school or as home planetarium.