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Sun Shadow Applet

More details: "Azimuth and Elevation Diagrams"

Sun Azimuth at Rise and Set

How to get this applet

This interactive applet displays the shadow of an object (building, wall, tree) for any location, date and time.

Select a location from the menu, or enter a decimal degree value for latitude (southern negative) into the text field of the applet,
enter a decimal degree value for longitude (western negative) into the text field, enter object height,
then hit the button "Apply input":

input 

The applet will adjust the timezone. As there are no definite rules for daylight saving time, check the time offset to get the correct local times.

Press RETURN after entering the object height.

You may use the keys "m", "d", "h", "n" to increase the month, date, hour, or minute,or Shift key and "m", "d", "h", "n" to decrease the month, date, hour, or minute!

Uncheck the "Trace" box to display a single shadow only.
status
The coordinates of the cross hair cursor are also shown in the status bar of the browser.

 

 

Comparing the applet results to those of USNO there are slight differences for small altitudes, which are due to the fact that USNO is taking into account the atmospheric refraction (relevant for very small altitudes only).

 

U.S. Naval Observatory,
Astronomical Applications

Choose from the "Write..." menu to get a table of elevation and azimuth angles:

azimuth elevation shadow

Press the "Get Time" button and enter the elevation angle of the Sun, or the length of the gnomon shadow, or the azimuth angle and hit RETURN to get the times.

This item is not yet working properly for latitudes near the equator, sorry.

How to get this applet


The length and the direction of the shadow depend on the elevation (altitude) and azimuth angle of the sun:

      

In nautics, the azimuth is measured eastwards from the North point, in astronomy westwards from the South point.  

Object height is 10 m, elevation angle is 27°, sun azimuth angle is 270°:


Object height is 20 m, elevation angle is 27°, sun azimuth angle is 270°:


Example:

Berlin, July 5, from 6:00 to 20:00

Running the applet hit the "h" key to increase the hour !

Watch animation

Some more details on my Sundial Page



Azimuth angle of the Sun
Berlin (51.51°
N, 13.41°E) on 2006, June 21
northern summer solstice



Azimuth angle of the Sun
23.5
°N, 13.41°E on 2006, June 21
northern summer solstice


 
Azimuth angle of the Sun
51.51
°S, 13.41°E on 2006, Dec 21
southern summer solstice



Azimuth angle of the Sun
0
°N, 13.41°E on 2006, Jun 21



Azimuth angle of the Sun
0
°N, 13.41°E on 2006, Sep 23
exinox


Please visit my GeoAstro Applet Collection


Last modified: 2013, Oct 14

© 2000-2013 Juergen Giesen