Diameter: 40 cm
Total height: 43
This is a rare and early Baader planetarium.
planetarium presents an absolutely unique method of demonstrating
The BAADER PLANETARIUM consists of three units: the star globe being
black and transparent simultaneously, the solar system including its
electric drive system,
located inside the globe and – finally – the planetarium’s base
containing the control equipment
The celestial globe of the BAADER PLANETARIUM is made of plexiglass
which has been subjected to a black color treatment to obtain
approximately 5% transparency. This
material provides an amazing optical effect: Under direct light the
sphere will appear almost opaque due to the light absorbing and
reflecting properties of the plexiglass. However, when
looking at the planetarium in a somewhat darker room, the human eye will
adapt itself to existing light conditions and the sphere will now appear
transparent: The solar System inside
the globe can be clearly seen.
The earth-moon system is
equipped with a miniature drive motor, having a variable speed. The
following motions can be demonstrated.
1. The earth revolving around the sun (revolution)
2. The earth rotating around its own axis (rotation)
3. Earth's axis pointing towards the celestial poles.
4. The motion of the moon around the earth
5. The shifting of the lunar nodes!
This mode of representation and
the precision achieved constitute an unique combination. lt greatly
facilitates apprehension of many relationships of the mechanics of the
The mechanics and causes of day and night, the mechanics of the seasons,
comprehension of the moon’s motion, light phases and eclipses. With
equal ease a number of phenomena can be explained: The tides, the time
zones of the earth, solar and sidereal time, the shift of the lunar
nodes, the relation between the celestial equator and the ecliptic
plane, the starry sky at various
periods of the year, circumpolar stars and their relation to
geographical latitude, the position of the orbital plane of a satellite,
the mechanics of the light phases of Venus, the Platonic year, the
changing of the equinoxes, the relativity of the observer’s position,
synodic, sidereal and draconitic time of the moon, a satellite’s
position in space.
The base of the planetarium
contains the transformer as well as two knobs for control of the model
earth’s motion and the light intensity of the projection lamp. A
flexible cable is used to
connect the transformer to the gear unit of the model earth. Thus the
globe including its internal gear systems can be turned around any axis
at any instant. By taking off the plastic cover producing the model
sun’s diffuse light, the projection capabilities of the BAADER
PLANETARIUM can be demonstrated. The point source of light provides a
negative projection of the starry sky – as seen at any time of the year
onto the ceiling of a room or hall up to a height of 15 ft – or onto one
of our projection domes. (Baader planetarium, general information)
In this BAADER planetarium also
the two planets orbiting the sun are electrically driven.
Not for sale