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Unformatted text preview: Celestial Equator- this is just a line that is directly above the Earth's Equator. Like the Earth's equator, the Celestial Equator goes all the way around the Celestial Sphere. We need to simplify some locations in the sky now. We can talk about stuff that is directly over head, or we can say stuff is at your zenith- this just means the location right over your head. You have a personal zenith and what is there depends upon where you are on the Earth, what time of day or night it is and what time of the year it is. There is also a term for the exact opposite of zenith, but we don't really care about that since it would be in the direction of the ground and there are no stars visible down there. Another special direction is the horizon , though that is not really one particular direction, but sort of, well, your horizon. To be kind of technical, the ground meets the sky at the horizon, and generally, there are 90º between the horizon and the zenith (especially in Iowa). If you do want to generally, there are 90º between the horizon and the zenith (especially in Iowa)....
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This note was uploaded on 11/22/2011 for the course AST AST1002 taught by Professor Emilyhoward during the Fall '10 term at Broward College.
- Fall '10