Using Figure 1, draw parallel lines from the dots to the edge of the circle. Each dot represents one day of data. Sunspots move along this curved surface, not in a straight line! Measure the angle through which the sunspot moved during this time by placing your protractor at the center of the Sun's circle and measuring the angle (in degrees) from the beginning position of the sunspot to the final position of the sunspot along the curved surface of the Sun. Use the formula below the table to determine the rotation rate of the Sun (in days). For Figure 2, you will need pick a sunspot (there are several on each drawing, but they are the same set) and follow it from drawing to drawing in a similar manner. Suggestion: Draw a vertical line from the sunspot to the edge of the disk in each drawing and follow the directions for Figure 1 above