Eclipses Motion of Moon

Eclipses Motion of Moon - EclipsesandtheMotionoftheMoon 1....

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Eclipses and the Motion of the Moon 1. Light Source a. The sun is the light source for our solar system b. The earth and moon are spherical i. Half of the earth and moon are always lit, and the other half are in the shadow 2. Phases of the Moon a. This is the percentage of the illuminated size we can see from earth i. New Moon 1. This is the shadowed side of the moon 2. This occurs at noon on the equator ii. Waxing Crescent Moon iii. First Quarter Moon iv. Waxing Gibbous Moon v. Full Moon 1. This is all of the illuminated side vi. Waning Gibbous Moon vii. Third Quarter Moon viii. Waning Crescent Moon b. From New to Full is known as waxing i. This is when the right side is lit c. From Full to New is waning i. This is when the left side is lit d. Time to think i. If a person close to the equator sees a first quarter moon overhead, what is the local time for this person? 1. 6 AM 2. 12 Noon 3. 6 PM 4. Midnight e. The moon is an excellent timekeeper! i. When you see the new moon, it is noon ii. When you see the full moon, it is midnight iii. The moon goes through its full rotation in about 29.5 days. This is how the ancient people build the 30-day calendar month. f. Can the moon be observed during the day? i. Sometimes you can see the moon during the day. This is because the earth is reflecting the light to the shadowed side of the moon g. Synchronous Rotation i. The same side of the moon always faces the earth! 1. You may see different pieces of the moon, but it is the same side! ii. Its rotational period = its orbital period 1. Everyone on earth will see the exact same think h. Solar vs. Sidereal i. A full 360 degree orbit around the earth takes about 27 days- sidereal ii. The phases of the moon go in full rotation in about 29.5 days- solar
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This note was uploaded on 09/21/2008 for the course ASTR 1100 taught by Professor Campbell during the Fall '07 term at LSU.

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Eclipses Motion of Moon - EclipsesandtheMotionoftheMoon 1....

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