___________________ DATE _______________ OBJECTIVE - Like the Earth, the Sun rotates on its axis. We see evidence of this by tracking the position of sunspots on the solar surface over a period of days and weeks. The purpose of this lab is to look at sequence of actual NASA photographs of the Sun and measure the positions of these sunspots as they migrate across the face of the Sun. PROCEDURE - Using the Solar Latitude/Longitude coordinate grid on the last page of this lab, measure the longitude (EAST-WEST position) of the most prominent sunspot. The latitude (NORTH-SOUTH position) is not needed. Begin with the earliest photo from January 3, 2011, record the date and time in the first row of the data table. Note that the time given is based on a 24 hr clock. Midnight is 00:00 hrs. Eight-thirty a.m. is 08:30 hrs. After noon hours, or p.m. hours are found by adding 12 hrs to the p.m. time, so for example 3:45 pm is shown as 15:45 hrs. Record the Longitude. Note the on the first day, there is no Longitude Change or elapsed time. Repeat the process for the second photo. This time, you will calculate the