Analemma – Location of the Sun each day at the Same Time
January 29, 2013
An analemma is the figure “8” loop that results when one observes the position of the sun at the same time during the day over the course of a year. Due to the earth’s tilt about its axis (23.45°) and its elliptical orbit about the sun, the location of the sun is not constant from day to day when observed at the same time on each day over the course of a full year. Furthermore, this loop will be inclined at different angles depending on one’s geographical latitude.
On Earth, the analemma appears as a figure eight, but on other solar system bodies it may be very different because of the interplay between the tilt of each body’s axis and the elliptical shape of its orbit. Marking the position of the Sun in the Martian sky would produce a teardrop.