Simulating the Apparent Motion of the Sun One can use the Starry Night program for Windows and the Macintosh to simulate the appearance of the sky at any time, from any chosen vantage point in the Solar System. Thus, by choosing different points on the surface of the Earth at different times of the year, this program can be used to show the motion of the Sun through the sky and illustrate clearly the preceding points about the causes for the seasons. Here is an extreme example: In the N. Hemisphere Summer at latitudes above the Arctic Circle (23.5 degrees away from the N. Pole) the Sun stays above the horizon for the entire day ( midnight sun ). The adjacent image illustrates the midnight sun. This GOES-8 weather satellite visible light image is taken from a vantage point high above the western hemisphere, with the North at the top. Even though the local time for the longitude line under the satellite is near midnight, the Northernmost portion of the globe is illuminated by sunlight (the lighted portion actually
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