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Lecture 6

Astronomy Lecture 6.docx

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Wilfrid Laurier University
Patrick Mc Graw

Astronomy Lecture 6 The number of daylight hours increases starting from the winter solstice until the summer solstice when they start decreasing again. The Equinoxes are in between (3/21, 9/21) and both have 12 hours of daylight and darkness. The Earth-Moon system - Face down on the earth, from the north pole - Moon revolves around the earth, in an elliptical path - It takes one month to orbit around How does the Moon shine? - It is a reflection from the sun The Inconstant Moon - Moon is a variable, it changes as it moves around the earth Phases of the moon - New moon - First quarter - Full Moon - Last quarter - Between new moon and first quarter, is crescent - Between first quarter and full is gibbous - Between full and last quarter is waning gibbous - Last quarter to new moon is crescent - No such thing as dark side - The line that divides the night time and day time is called terminator Moon rise and Moon set - Moon rises at the same time the sun sets - New: rise and set with the sun - Waxi
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