NATS 1745 Lecture Notes - Lecture 5: Celestial Equator, Top, Dailymotion
24 Jan 2018
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The sun passes exactly on the celestial equator on the first day of spring/fall. The sun is exactly 23. 5 degrees north of the east(??) on the first day of summer. Equinoxes are when the day and nights last the same amount of time. Day by day (or night) the sun moves about 1 degree eastward to complete 1 year. Daily motion of the sun is westward and the earth spins around itself. The earth spins because of precession (think of a spinning top) The polaris wont always be the north star because of this (the earth spins in a pattern which is completed every 26000 years) At midnight the stars overhead are opposite the sun in the sky. As earth orbits the sun, the sun appears to move eastward along the ecliptic. For the constellation thing with the sun, look at the date of which earth is at (outside circle), connect it to the sun and continue along that line.
