1921 Star Finder and Identifier Patent Print, Gilbert Rude Star Finder Chart, Nautical Decor, Marine Celestial Navigation System Patent

Capt. Gilbert Rude invented the star finder in 1920. The star finder allows for sight planning so that a round of stars can be efficiently performed during the brief twilight period. The sextant is pre-set to the approximate altitude so that a star will be seen through the sextant optic when held to the horizon in the general azimuth direction. An unidentified star can be observed then identified later during sight reduction using the star finder.

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