Annals of Science 50 (1):83-93 (1993)

The true form of the seasonal-hour sundial, in both vertical and horizontal planes, has been calculated by spherical trigonometry and displayed with the aid of computer graphics. These grids are presented, and show that the hour lines are in fact shallow curves at sites not on the equator. The curvature becomes very apparent at latitudes exceeding 50°. The true seasonal-hour pattern for a vertical dial at a latitude of 52·6°N is compared with the equiangular scratch dial
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DOI 10.1080/00033799300200131
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The Diagram of Unequal Hours.Margarida Archinard - 1990 - Annals of Science 47 (2):173-190.
Greek and Roman Sundials.Sharon Gibbs - 1978 - Revue d'Histoire des Sciences 31 (1):80-81.

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