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|
 GeoAstro Applets |
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 Java |
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Cone
Sundial
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Enter latitude in decimal degrees and press return key, |
|
|
you
may
use
the
keys "h", "d", "m" to increase
the hour, date, or month, |
| The gnomon
(length L) of this sundial is horizontal and pointing to the south. The
x-coordinate is measured from the origin O to the right along the upper
circle, and y along the lateral surface of the cone. The (horizontal) declination lines are drawn for 0° (black), +/- 4°, +/- 8°, +/- 12°, +/- 16°, +/- 20° (gray), and +/- 23.44° (red/blue). Click into the applet area to shift the drawing up or down, and use the "Details" options for scaling. |
| Declination (°) |
Dates |
| -23.44 | Dec 21 |
| -20 | Nov 21, Jan 20 |
| -16 | Nov 06, Feb 05 |
| -12 | Oct 25, Feb 17 |
| -8 | Oct 13, Feb 28 |
| -4 | Oct 03, Mar 10 |
| 0 | Sep 23, Mar 21 |
| 4 | Sep 12, Mar 30 |
| 8 | Sep 02, Apr 10 |
| 12 | Aug 21, Apr 21 |
| 16 | Aug 08, May 04 |
| 20 | Jul 23, May 20 |
| 23.44 | Jun 21 |
Sundial
(2α=90°) at 51.62°N
7.79°E on January 20 at 11:00 standard time
More of my sundial applets ...
Updated:
2010,
Jan
20
©
2010 J. Giesen
