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   Analemma Sundial Applet

Click into the grid plane to change the gnomon position

Localized applet version

	Check your time zone offset and the local time.
	Select the view details from the "Analemma..." menu.
	Select latitude (northern positive, southern negative), and longitude (eastern positive, western negative) from the menus.
	You may use the keys "m", "d", "h", "n" to increase the month, date, hour, minute, or Shift key and "m", "d", "h", "n" to decrease month, date, hour, minute !
	Analemma: 1 = Dec 21 - Jun 21 (blue) 2 = Jun 21 - Dec 21 (red)

Make your own sundial !

How to get this applet for offline use

More of my sundials:

Pie Sundial

Horizontal Sundial

Sidereal Sundial

This type of sundial has a vertical rod (gnomon, height H) casting the shadow on a horizontal plane. The shadow of the gnomon's top (point P) is used to read the time (and the date).     Example: Berlin 52.51 N, 13.41 E   October 20 at 15:15, or Feb 21 at 15:45 An analemma is the figure-of-eight shape that results if the Sun's position in the sky is recorded at the same time of day throughout the year. As a consequence the gnomon draws a similar figure. Watch an animation. The red part of the analemma is used to read the time from summer solstice (June 21) to winter solstice (Dec. 22), the blue line from winter solstice to summer solstice. The diurnal lines are painted for (data 2002): 6/21 (summer solstice) 6/1 8/1 9/1 9/23 (vernal equinox) 10/1 11/1 12/1 and 5/1 4/1 3/20 (spring equinox) 3/1 2/1 1/1 12/22 (winter solstice)   10 units of the "Gnomon Height" menu correspond to 4 units of the grid, e. g. "Gnomon Height 10" selected, and elevation angle of 45° the length of the shadow is 4 grid units: The length of the gnomon is indicated by a horizontal red line:   Click into the grid to change the position of the gnomon.    Choose "Current" from the "Analemma..." menu to show the current position of the sun, the analemma for the current time and the diurnal line for the current day: An analemma is the figure-of-eight shape that results if the Sun's position in the sky is recorded at the same time of day throughout the year. As a consequence the gnomon draws a similar figure. Watch an animation.     Please visit my pages: Sonnenuhren / Sundials Sunshadow Applet and animation     Web Links Analemma - The solar tracking software Project The Analemma (Bob Urschel) Ausführliche astronomische und mathematische Darstellung Wanderung der Mittagsposition im Verlauf eines Jahres (David Przewozny) The Analemma Project (Steve Irvine) The Analemma Sundials on the Internet Deutsche Gesellschaft für Chronometrie e.V. Sundial Links (Daniel Roth) Shadows (François Blateyron) A great sundial program for Windows (download, freeware) Sundials on the Internet - Sundial Design Software The Dialist's Companion DOS program that calculates a wide range of data elements of interest to dialists and others who are concerned with phenomena associated with solar time. Die Lebende Sonnenuhr (AstroMedia*Verlag) North American Sundial Society Fachgruppe Uhren (Förderkreis Industrie- und Technikgeschichte) Sonnenuhren - Unterrichtshilfen für Schüler und Lehrer Virtual Sundial   Please visit my GeoAstro Applet Collection   Last Modified: 2023, Oct 05 © 2001-2013 Juergen Giesen