ASTR 101 Lecture Notes - Lecture 3: Moon Illusion, Supermoon, Blue Moon
8 Feb 2017
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Precession: orientation of earth"s axis changes with time. The axis of the earth changed slowly over 26,000 years de to the gravitational tug of the giant planets and others. (takes 26,000 years to do this circle) Earth"s axis precesses like the axis of a spinning top. Traditional folklore: harvest & hunter"s moons, blue moon, super moon. Lunisolar: hebrew, buddhist, hindu, kurdish, bengali, tibetan, chinese, japanese, Seems to be recorded from really old times (aurignacian culture, 32,000bc &lascauz paintings 15,000 years old) Optical/psychological illusion that causes the moon to appear larger near the horizon than it does higher up in the sky. There is no gravity on the moon the moon does have gravity (like every physical body, sun moon, earth, you and a tiny atom everything that is made of material has a gravitational pull) The force of gravity on the moon is weaker than on earth, about 1/6 of earth"s gravity.
