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.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Kalman, B.: 1979, C. Sc. Thesis, Leningrad.
Press, W. H., Flannery, B. P., Teukolsky, S. A., and Vetterling, W. T.: 1986, Numerical Recipes, Cambridge University Press, Cambridge.
Smart, W. M.: 1977, Textbook on Spherical Astronomy, Cambridge University Press, Cambridge.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Györi, L. On the determination of the north direction of the sun's image. Sol Phys 120, 421–430 (1989). https://doi.org/10.1007/BF00159889
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF00159889