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Azimuth Spider Applet

This horizontal sundial depends on the azimuth angle of the Sun. The gnomon is located in the  center of the dial and perpendicular to the dial plate. Read the time (standard or apparent) at the intersection point of the shadow of the gnomon with the circle of the current date. The Sundial Garden of the Deutsches Museum (Munic) is showing this kind of dial in action (calculated and constructed Yves Opizzo and Christian Tobis).

	Check your time zone offset and select the local standard time.
	Click the applet first! Enter latitude in decimal degrees and press return key, enter longitude in decimal degrees and press return key.
	You may use the keys "y", "m", "d", "h", "n" to increase the year, month, date, hour, minute, or Shift key and "y", "m", "d", "h", "n" to decrease the year, month, date, hour, minute !
	Click into the spider web to get the date and the azimuth.
	Check the box to choose apparent (solar) time, uncheck for standard time.
	Select from the "Options" menu. "on/off" items are working in toggle mode.
	The times of transit, sunrise, and sunset are standard time.

Azimuth Spider Sundial by Yves Opizzo,
Muenster-Gievenbeck, Freiherr-vom-Stein-Gymnasium,
51° 57' 40'' N, 7° 34' 06'' E
The gnomon is parallel to the Earth's axis, the diameter of the spider about 14 m.

The shadow on 2010, July 12 at 13:00 CEST

North Finder

My Sundial Applets

Applets: Ancient Sundials and Quadrants

Web Links

The Sundial Primer: Spider Sundials Horizontal Spider Sundial Sonnenuhren-Spinne (Wikipedia) Spinnensonnenuhr / Cadran solaire du type araignée (Yves Opizzo) The Sundial Garden (Deutsches Museum Munic)

Last Modified: 2010, Jul 12

© 2009-2010 Juergen Giesen