Motion of the Sun

Motion of the Sun - Motion of the Sun Originally, on the...

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Motion of the Sun Originally, on the Vernal Equinox in 2000 BC, the Sun was located in between Aries and Pisces, so for the next month everyone should be an Aries (March 21 - April 21). Due to the Earth's precession, the Earth has wobbled so much that the celestial poles and equator are aligned with different parts of the sky. Things got screwed up, since the location of the celestial equator defines the location in the sky where the equinoxes occur. Now, on the Vernal Equinox, the Sun is not at the same location relative to the stars it was in when the system was set up. It's actually in Pisces and getting closer to Aquarius - which, by the way, is sort of the basis for that song "Age of Aquarius," but you might be too young to remember that golden oldie. The beginnings of the seasons have also slowly changed relative to the stars, since the equinoxes mark these. It used to be that the first day of spring occurred when the Sun was in front of the stars of Aries; now it occurs when the Sun is in front of the stars of Pisces. I've put together two little movies that show how the changing orientation of the Earth's poles
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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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