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Physics Quiz
   

Cone Sundial


 


cone sundial
              conic

latitude 

longitude 

Enter latitude in decimal degrees (southern negative),

 enter longitude in decimal degrees (western negative),

the hit the button "Apply input".

Key commands:

you may use the keys "h", "d", "m" to increase the hour, date, or month,
or
Shift key and "h", "d", "m" to decrease the hour, date, or month !
Click the applet first !


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


cone sundial

cone sundial

Sundial (2α=90°) at 51.62°N 7.79°E on January 20 at 11:00 standard time

More of my sundial applets ...

Updated: 20.10.2023

© 2010-2023 J. Giesen

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