ASTR 151 Week 2 Notes
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This 2 page Class Notes was uploaded by Wesley Fowler on Sunday January 24, 2016. The Class Notes belongs to ASTR 151 001 at a university taught by Dr. Sean Lindsay in Spring 2016. Since its upload, it has received 66 views.
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Better than the professor's notes. I could actually understand what the heck was going on. Will be back for help in this class.
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Date Created: 01/24/16
Wesley Fowler ASTR 151 152 Chapter 1 Motions of the Moon Average distance between the Earth and Moon is 384,500 Km Synodic Month: Full cycle of moon phases (29.5 days) Sidereal Month: Time for moon to revolve around Earth 360 degrees (27.5 days) Synodic Period: 4 weeks The moon is always half lit, acting as a reflecting “mirror” of sunlight. Eclipses Eclipses occur when the Sun, Moon, and Earth form a straight line. When the shadows align. - Lunar Eclipse: The Earth is between the sun and the moon. Total or partial. Full Moon - Solar Eclipse: The Moon is between the sun and the earth. New Moon o Penumbra: Sun partially visible. Outer shadow o Umbra: Sun completely obscured. Inner shadow Corona: Crest of the sun. HOT Diamond Ring affect: Seeing the rim of the sun during an eclipse just before or after an eclipse. Eclipses do not occur every month because the Moon’s orbit is inclined 5.2 degrees with respect to Earth’s orbital plane. Tilted tiles. Distance Measurement What do you need? - Baseline distance - An angle () Parallax: The measurement of angular distance (apparent motion, arcsec) relative to two different background vantage points. The earth’s diameter is too short of a baseline to calculate parallax, the diameter of Earth’s solar orbit is though! Largest we can possibly have, June December. greater distance = smaller angle Eratothanes’ Method: Deduced the Earth’s circumference to be 39,000km 2300 years - Actually 40,075km Diameter = Distance x (Angular Diameter/57.3 degrees)
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