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In this paper we evaluate the performance of a plausible configuration for the solar disk sextant, an instrument to be used to monitor the solar diameter. Overall system requirements are evaluated, and tolerable uncertainties are obtained. We conclude that by using a beam splitting wedge, a folded optics design can be used to measure the solar diameter to an accuracy of 10−6, despite the greater aberrations present in such optical systems.
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Chiu et al. (1984) studied this question.
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