title: Guiding of balloon-borne telescopes by off-set sun-tracking.
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.
authors.affiliation: Laboratory of Astrophysics and Physical Meteorology, The Johns Hopkins University, Baltimore,Maryland 21218, USA.
authors.forename: M
authors.initials: M
authors.lastname: Bottema