Day & Night Applet

The yellow circle is the image point of the sun, where the line from the sun to the center of the earth intersects it's surface. The coordinates (latitude and longitude) are the same as the declination and Greenwich-Hour-Angle (GHA) of the sun.

A click into the map dispays the coordinates, the shadow of a 50 pixel vertical gnomon, and the elevation of the sun.

This applet should display the correct time difference between zone time and Greenwich Time (GMT ):