The sun appears to move across the sky, because the earth spins on its axis. To a person standing on the earth, the sun subtends an angle of sun = 9.30 x 10-3 rad (see Conceptual Example 2). How much time (in seconds) does it take for the sun to move a distance equal to its own diameter? I know that I probably need convert radians to degrees and find the length of the r first? I just don't know where the heck the time factor comes in this rotational kinematics problem. There seems to not be enough information.