Motion of the Su4

Motion of the Su4 - Motion of the Sun As is apparent, the...

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Motion of the Sun As is apparent, the path of the Sun is curved relative to the Celestial Equator. There are times during the year when it is north of the Celestial Equator and other times when it is south of it. The declination of the Sun varies throughout the year. (Of course, its R. A. changes as well, becoming slowly larger each day as the Sun moves eastward relative to the stars, but we'll pay more attention to the declination). On the days of the Equinoxes, the Sun is right on the Celestial Equator, so it has a declination of 0º, and on the Solstices, it has the most extreme value for its declination, 23.5º N on the date of the Summer Solstice and 23.5º S on the Winter Solstice. The Solstice dates mark when the Sun is at its greatest distance from the Celestial Equator. The path the Sun appears to make amongst the stars is known as the ecliptic . Just like the Celestial Equator, it would make a large circle on the Celestial Sphere. In fact the ecliptic is a big circle that is tilted 23.5º relative to the circle made by the Celestial equator. This is shown in
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This note was uploaded on 12/15/2011 for the course AST AST1002 taught by Professor Emilyhoward during the Fall '10 term at Broward College.

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