A balloon-borne system for tracking the sun both in elevation and azimuth is described. The system weighs approximately 125 lb and is capable of ``pointing'' as much as 20 lb of payload at a predetermined position in the sky. Power requirements are 20 w. An accuracy in pointing of ±15 min of arc has been achieved. At some sacrifice in simplicity, this accuracy could perhaps be improved to ±5 min. Results of two flights, each attaining an altitude in excess of 100 000 ft, are given.
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Edwards et al. (1956) studied this question.