Planetarium having an auxiliary projector independently rotatabl

Details Planetarium having an auxiliary projector independently rotatabl Planetarium having an auxiliary projector independently rotatabl

1985-04-22

1987-02-17

Grieb, William H.

Education and demonstration

Science

Astronomy

G09B 2700

Patent

active

046436812

ABSTRACT:
A planetarium comprises a star field projector which projects the star field, a ring-shaped member which supports the star field projector rotatably about a first axis, a first rotating member which supports the ring-shaped member rotatably about a second axis orthogonally crossing the first axis, a support base which supports the first rotating member rotatably about a third axis orthogonally crossing the second axis, a second rotating member provided on the support base rotatable about the third axis independent of the first rotating member, and a coordinates projector provided on the second rotating member.

REFERENCES:
patent: 3074183 (1963-01-01), Frank
patent: 3571954 (1971-03-01), Frank
patent: 4020568 (1977-05-01), Tajima et al.

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