Sundials are devices for telling time by measuring the position of the shadow of the sun. This category lists websites concerned with the theory of sundials.

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The Analemmatic Sundial
Describes design and construction of a six meter wide analemmatic sundial in Canada.
Analemmatic Sundials
Descriptions of these vertical post sundials, why they work, detailed account of the maths necessary to plot the hour lines.
The British Sundial Society
Information on the society, links, beginner's pages, including simple sundial patterns and templates, online facilities to calculate hour lines for different sundial types.
Cadrans Solaire
Describes different types of sundials, has other technical and general information. Offers free Shadows software to compute sundials of a number of different types for anywhere in the world.
Encyclopaedia Britannica - Sundials and Shadow Clocks
Animations of some of the historical stages of the development of sundials.
Frans Maes' Sundial Site
Describes a number of sundials of different types, mostly from northern Europe.
Jaipur - Jantar Mantar
Describes the jantar mantar (or yantra mandir) of Jaipur, and the massive sundials and other astronomical devices built there.
Macmillan Hunter Sundials
A range of sundials for measuring the hours and reading the season as well as astronomical instruments for complex calculations.
The North American Sundial Society
Includes general information, links, a register of dials in North America, and a message board.
A Photo Collection of Beautiful Painted Wall Sundials
Photographs with descriptions, showing a number of patterns painted on walls.
Solar Time
Describes sundials that can tell sunrise and sunset times, the angle of solar declination and the time at night. (Flash based site).
Sunbeams & Sundials - Liverpool Museums
Guides to the use of the sun for telling time and marking the seasons.
SUNDI: Sundial Design Software
Shareware and freeware software for design and planning for the most popular.
Sundial - Wikipedia
Account includes a description of the commoner types, an explanation of the relevant science and maths, and a history of sundial use.
Sundial Design Program
Software to design a vertical (wall mounting) sundial for walls that face up to 60 degrees away from due-south.
Sundial Information
Describes sundial parts and names, the basic types, and has make your own pages for three simple types of dial.
The Sundial Primer - Get "Hooked on Gnomonics"
Offers advice, instructions, and resources for creating a wide variety of sundials.
Describes the history and development in Europe from the time of the Greeks. Includes literary and poetic references.
Sundials of Scotland
Descriptions with photographs of Scottish sundials, ancient, old and new as well as sundials from some other places. Includes registers of sundials seen, which are fully searchable by any criterion.
Sundials on the Internet
A major information source, with projects, detailed technical information, links to related sites, listings of societies.
Sundials: the Art of Shadows
An essay on the use of sundials in gardens.

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