ASTR-1010 Lecture Notes - Lecture 6: Lunar Phase, Lunar Eclipse, Apsis
6 Oct 2016
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Document Summary
Moon is about the same width of the united states, to scale of a globe: you could fit 30 earths between the earth and the moon. Why do we see the phases of the moon: moo orbits around the earth, moon is (almost!) always illuminated by the sun, earth sees some combination of light and dark parts. 29. 5 days for the moon to go around the earth called a moonth: first quarter waxing gibbous full waning gibbous third quarter waning crescent new waxing crescent. Waning crescent light on the left hand side. It rises 6 hours before it"s highest in the sky. What causes the eclipses: earth and moon cast shadows, lunar eclipse: moon in earth"s shadow. Happen during full moon: solar eclipse: earth in moon"s shadow. Perigee when it"s at its closest. Apogee- when it"s at its furthest (the moon) Annular makes an annulus (ring) around the sun.
