On the determination of the north direction of the sun's image

Details On the determination of the north direction of the sun's image On the determination of the north direction of the sun's image

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989soph..120..421g&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 120, no. 2, 1989, p. 421-430.

Physics

5

Instrument Errors, Solar Position, Spectroheliographs, Error Analysis, Misalignment, Refractivity

Scientific paper

For a perfectly aligned Coude 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 this dependence is derived.

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