The Sun Charts How the Sun Works

For our purposes, it is convenient to assume that the earth is stationary and the sun is in motion around the earth. Figure V-1 lists the angle (declination) of the sun above (+) or below (-) the equator, on the twentieth of each month, as seen from the earth. From the Northern Hemisphere, you can … Read more

Sundials Earth’s Declination

A sundial is a device that uses the position of the sun to tell time. Sundials work by casting a shadow on a marked surface, with the length and direction of the shadow indicating the time of day. The earth’s declination, or the angle at which the earth’s axis is tilted relative to its orbit … Read more