Tracking the movement of a sunspot helps us determine the Sun's rate of rotation.
This is the template
Look at your sun sketches and pick a sunspot group which is easy to see and which appears over a period of several days. Make a transparent copy of the template, lay it over your images, and figure out how many degrees your spot group has moved. Like this:
[Amara -- We need 2 images of a sunspot group, with the grid superimposed on them. Beneath each we need a time-stamp. Can you create these???]
angular velocity = 90 / 7.5 = 12 degrees/day
Sun's rotation period = 360 degrees / angular velocity
So, in this example, we find the Sun's rotation period = 360/12 = 30 days
Return to the Angular Velocity exercize