ASTR 1P01 Lecture Notes - Leap Year, Astronomical Unit, Diurnal Motion
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ASTR 1P01 Full Course Notes
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Friday september 7, 2012- monday september 10th, 2012. Astronomy is science - astrology is a form of divination. A short survey of the universe and in the distance scales (review scientific notations = powers of 10) Earth: - approximately a sphere radius of the earth = 6,400 km (diameter is twice the radius) Ancient greeks knew (in particular aristotle 384 b. c 322 b. c) that the earth must be a sphere. Also, it is responsible for the fact that an observer on earth see the sun, the moon and the stars move from east to west. Full spin/24h = 360 degrees/24 h = 15 degrees/hour. An observer approaching the sunset line (he moves together with earth) would see the following: Also, the earth revolves around the sun- once every 356 = The is the reason for having leap year in calendars. The average earth moon distance is about 384,000 km (the radius of the moon is about of the earths radius)