Unlike the planets, the sun is a great big sphere of hydrogen gas. Because of this, different parts of the sun rotate at different speeds. You can see how fast the surface is rotating by tracking the movement of sunspots across the surface. Regions at the equator take 25 days to complete one rotation, while features at the poles can take 36 days and the inside of the sun seems to take about 27 days.
Watch Video Clip: http://starchild.gsfc.nasa.gov/Videos/StarChild
As the World Turns… Gather around the globe. Identify the country you live in. Then identify the state that you live in. Label that state with highlighter tape. Turn off the lights. The darkness of the room represents the darkness of the sky that surrounds the Earth. The light from the flashlight represents the sun. Shine the flashlight on the globe, with the light pointing at the globe. If the light is shining on your state, “Is it daytime or nighttime?”
As the World Turns… Slowly turn the globe with out moving the flashlight. Examine how the sunlight falls on different areas of the Earth at different times. Watch for the moment that your state is opposite of the light. “Is it daytime or nighttime? Is there sunlight shining on the state we live in? Can we see the sun at night?”