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Unformatted text preview: 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 0, and on the Solstices, it has the most extreme value for its declination, 23.5 N on the date of the Summer Solstice and 23.5 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 23.5 relative to the circle made by the Celestial equator. This is shown in Figure 2....
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- Fall '10