Multiple projector planetarium drive system

Details Multiple projector planetarium drive system Multiple projector planetarium drive system

1985-04-26

1987-01-27

Grieb, William H.

Education and demonstration

Science

Astronomy

G09B 2700

Patent

active

046392246

ABSTRACT:
A planetarium includes a fixed star field projector and a plurality of planet projectors spaced from the star field projector. A computerized control controls the rotation of the projectors, each of the planet projectors being controlled in its rotation about a pair of perpendicular axes alternatively in two modes, in the first mode the projected image traversing normal apparent orbital or other path in the star field and in the second mode the image traversing the shortest path from an initial point to a terminal point in the star field which points represent different times and/or points of observation.

REFERENCES:
patent: 3074183 (1963-01-01), Frank
patent: 3256619 (1966-06-01), Frank
patent: 3571954 (1971-03-01), Frank
patent: 3574955 (1971-04-01), Skolnick
patent: 3934358 (1976-01-01), Kitano et al.
patent: 4020568 (1977-05-01), Tajima et al.

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