On the determination of the north direction of the sun's image |
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| Authors: | L Györi |
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| Institution: | (1) Heliophysical Observatory of the Hungarian Academy of Sciences, Gyula Observing Station, P.O. Box93, 5701 Gyula, Hungary |
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| Abstract: | For a perfectly aligned Coudé heliograph the north direction of Sun's image in the image plane of the heliograph changes linearly with the hour angle of the Sun or in a common heliograph it is constant. But if the alignment is not perfect and there are instrumental errors the angle between the north direction of the Sun's image and a direction fixed in the image plane is a complicated function of the hour angle of the Sun. In this paper we derive this dependence. |
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