Three dials, and a few more: a practical introduction to accurate gnomonics
Abstract
Sundials provide an interesting application for the MetaPost graphical programming language, at the intersection of geometry, astronomy and time. This article considers three classical sundial drawings (normal hours, horizontal coordinates, and Babylonian/Italian hours), shows how to reproduce them accurately, and extends the study to related dials, such as those showing the declination, temporary hours, or sidereal time. Analemmatic sundials, related to common sundials, are also covered.
Domains
Software Engineering [cs.SE]
Origin : Files produced by the author(s)
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