Patent
1975-01-06
1977-03-22
Grieb, William H.
G09B 2900
Patent
active
040128512
ABSTRACT:
A planisphere for providing displays and effecting calculations in both astronomy and navigation and the method of operation thereof. The planisphere structure includes a plurality of substantially circular, concentric, flat dials which are progressively larger in diameter toward a central, largest diameter dial on both sides of the central, largest diameter dial. The dials are pivotally mounted centrally and have both astronomy and navigation oriented scales as well as star and polar azimuthal equidistant projection maps thereon. Reference rules and scale indicators, Greenwich indicators and Aries indicators, the latter three of which are part of specific planisphere dials, extend radially outwardly of the largest diameter dial on both sides of the planisphere and are connected together radially outwardly of each other respectively so that they may be readily moved relative to each other in angularly positioning the dials in operation of the planisphere. An altitude and azimuth circle reference indicator is provided with the planisphere to aid in triangulation operations and determining relative altitude and azimuth of celestial bodies when it is located on the assumed coordinate position of the navigator.
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
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