Optics: measuring and testing – Angle measuring or angular axial alignment – Apex of angle at observing or detecting station
Patent
1981-03-02
1984-05-22
Rosenberger, R. A.
Optics: measuring and testing
Angle measuring or angular axial alignment
Apex of angle at observing or detecting station
356146, 33268, G01C 100, G01C 114, G02B 2304
Patent
active
044498179
ABSTRACT:
Celestial navigational instrument and method of determination of local latitude and local hour angle of Aries by a single sighting on the night sky. Greenwich hour angle of Aries and latitude are obtained by simple reference to the instrument's scales and to a watch and Nautical Almanac; sight reduction tables, plotting boards and charts are not required. The instrument comprises a sky assembly and a horizon assembly. The sky assembly includes a closed central axial tube on which are rotatably mounted a combined periscope/telescope tube for sighting a first star and a periscope tube for sighting a second star, the siderial hour angular positions of both of which are set with respect to a single sky wheel and the polar distances of each periscope turret with respect to protractor scales. The horizon assembly comprises a periscope/telescope assemby mounted on the central axial tube and indexed to a horizon wheel and protractor scale to read the local hour angle of Aries and local latitude. A beam splitter, mirrors and optical lens elements are mounted to permit simultaneous observation of two stars and the horizon.
REFERENCES:
patent: 2758377 (1956-08-01), Claret et al.
patent: 4083636 (1978-04-01), Owen
patent: 4294541 (1981-10-01), Abler
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