Daylight Duration

Sunrise-sunset on the main program toolbar to create these graphs.  If done with a map open, you must click on the map to select a location.  If done without a map, you enter the coordinates.


Computations on the Analyze menu which lets you enter the coordinates of the location, and lets you compute other factors from the same location.

The red curve shows the time for sunset; the green curve the time for sunrise, and the blue curve the duration of daylight. Note the difference between the two locations at the same latitude but different hemispheres, and the same hemisphere but different latitudes. At high latitudes, the graphs can be puzzling at first glance.

Location about 61N.

Location about 61S.

Location about 15N.

Note that these times give a best guess estimate for the difference to UTC.

Last revision 12/24/2009