Guiding of balloon-borne telescopes by off-set sun-tracking.

Authors :: Bottema M
Source :: Applied optics [Appl Opt] 1967 Feb 01; Vol. 6 (2), pp. 213-9.
Publication Year :: 1967
Abstract: Two methods of off-set sun-tracking are described which were developed as part of the balloon-astronomy program of The Johns Hopkins University for daytime observations of the planet Venus. The performance of the system in flight, while subject to oscillations in the suspension system, is discussed.