Fixed-star projecting machine for planetarium

Details Fixed-star projecting machine for planetarium Fixed-star projecting machine for planetarium

1985-04-17

1986-05-13

Grieb, William H.

Education and demonstration

Science

Astronomy

G09B 2700

Patent

active

045883840

ABSTRACT:
A fixed-star projecting machine for a planetarium includes a fixed-star projection lens unit in each polygon of the globe surface of a fixed-star projection globe divided into a plurality of parts. Of these projection lens units, one whose projection range covers both sides of the equator is adapted to have its optical axis shifted in the direction which increases the attaching angle. The star positions of the fixed-star negative of the shifted projection lens unit are corrected to the normal projection positions according to the amount of shift.

REFERENCES:
patent: 1616736 (1927-02-01), Bauersfeld
patent: 1693969 (1928-12-01), Villiger et al.
patent: 2483216 (1949-09-01), Marshall
patent: 3571954 (1966-05-01), Frank
patent: 3863363 (1975-02-01), Miyajima
patent: 4403964 (1983-09-01), Meier

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