Universal planisphere, sight reduction finder and identifier, gu

Details Universal planisphere, sight reduction finder and identifier, gu Universal planisphere, sight reduction finder and identifier, gu

1977-03-21

1978-04-11

Grieb, William H.

G09B 2900

Patent

active

040831213

ABSTRACT:
A planisphere including a navigation west and east dial and scales, sky map, Greenwich and transit indicator dials having an Ariers indicator, a Greenwich indicator and a transit scale indicator respectively thereon, and a reference rule, constructed and arranged to facilitate programming of the elements thereof to provide an automatic computerized reading directly of local hour angle of stars from a local hour angle scale of the sky mask dial for entering sight reduction tables for navigation purposes. The planisphere also includes specific time zone indications to facilitate correct programming thereof and a declination scale on the reference indicator for determining declination of stars. The transit scale indicator includes opaque and transparent portions arranged so that scales of the planisphere are completely visible on one side or the other of the planisphere. The planisphere includes similar dials, scales and indicators on opposite sides thereof, with the dials and scales so related and the indicators connected together at the outer end thereof, whereby a double check of the programming of the planisphere is possible. The opposite sides of the planisphere are in ground position and overhead configuration, respectively.

REFERENCES:
patent: 497917 (1893-05-01), Gleason
patent: 531060 (1894-12-01), Ormsby
patent: 1873595 (1932-08-01), Johnson
patent: 2921386 (1960-01-01), Stefano
patent: 3290799 (1966-12-01), Eisenhauer
patent: 3673710 (1972-07-01), Eisenhauer
patent: 3858334 (1975-01-01), Eisenhauer
patent: 4012851 (1977-03-01), Eisenhauer

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