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Three dials, and a few more: a practical introduction to accurate gnomonics

Denis Roegel 1
1 MOSEL - Proof-oriented development of computer-based systems
INRIA Lorraine, LORIA - Laboratoire Lorrain de Recherche en Informatique et ses Applications
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.
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https://hal.inria.fr/inria-00172407
Contributor : Denis Roegel <>
Submitted on : Sunday, September 16, 2007 - 10:51:49 PM
Last modification on : Friday, February 26, 2021 - 3:28:05 PM
Long-term archiving on: : Monday, September 24, 2012 - 12:26:03 PM

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Denis Roegel. Three dials, and a few more: a practical introduction to accurate gnomonics. [Technical Report] 2007, pp.70. ⟨inria-00172407⟩

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