ANALEMMA

The blurb from the vid: Time-lapse of the Sun in the West, one picture every 24 hours: the solar analemma. Watch as the Sun traces out a figure 8 in the sky each year. Why does the position of the Sun change day-to-day? The Earth spins about its axis at about a 23.5 degree angle to its orbital axis around the Sun, and the Earth orbits the Sun in an ellipse, moving faster when closer to the Sun. The result is that the position of the Sun in the sky changes not just minute by minute as the Earth rotates, but day to day as well as the Earth moves through its orbit. The figure 8 path traced out by the Sun when viewed in 24 hour increments is known as the solar analemma.