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Lec04-Jan28[1] - Astro 109 Lecture 4 Learning from the Sun...

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Unformatted text preview: 1/28/11 Astro 109 Lecture 4: Learning from the Sun and Moon Jan. 28 [email protected] about reading or homework? Jan. 28 Quiz [email protected] #1 Tonight the Moon is approximately third quarter. What will its phase be next Friday? A. B. C. D. E. new crescent first quarter full third quarter Quiz [email protected] #2 We see the same face of the Moon at all @mes because A. B. C. D. E. the other face is always dark. the Moon does not rotate. the Moon's [email protected] period equals its orbital period. the Sun illuminates only half the Moon at any @me. the Moon's orbit is slightly inclined [email protected] to the [email protected] Jan. 28 Jan. 28 Quiz [email protected] #3 A solar eclipse can happen A. B. C. D. E. at any lunar phase. only at new Moon. only at full Moon. at either new Moon or full Moon. at either first or third quarter Moon. Key Concepts how we see the Moon eclipses the ancient Greeks were clever Jan. 28 Jan. 28 1 1/28/11 Phases of the Moon Thought [email protected] Suppose the Moon were a cube with the same side always facing Earth. What would its phases be like? A. It would not have phases. B. The phases would be just like now. C. The same as now, except square: crescent square, half-square, full-square, etc. D. It would have only new and full phases. Jan. 28 hZp://ganymede.nmsu.edu/tharriso/ast110/class05.html Jan. 28 Understanding lunar phases Discussion [email protected] What @me does the first quarter Moon rise? A. B. C. D. sunrise noon sunset midnight Jan. 28 Jan. 28 Discussion [email protected] If you were on the Moon, the Earth would A. B. C. D. show no phases. always be a crescent. always be full. show phases the same as the Moon (i.e., when it is full Moon it is also full Earth, etc.). E. show phases opposite to the Moon (i.e., when it is full Moon it is new Earth, etc.). Jan. 28 flickr Jan. 28 2 1/28/11 Jan. 28 Jan. 28 Does the Moon rotate? hZp://www.lpi.usra.edu/lunar/missions/[email protected]/images/ Jan. 28 Jan. 28 Solar Eclipse Jan. 28 hZp://apod.nasa.gov/apod/ap060404.html Jan. 28 3 1/28/11 Solar Corona Taken from Mir space [email protected], Aug. 11, 1999 Jan. 28 Jan. 28 hZp://apod.nasa.gov/apod/ap090726.html Lunar Eclipse Jan. 28 Jan. 28 Discussion [email protected] Suppose you observe a lunar eclipse tonight. The earliest possible @me for the next solar eclipse would be A. B. C. D. E. 12 hours later. 14 days later. 1 month later. 1 year later. 18 years later. Why don't we see eclipses every month? Jan. 28 Jan. 28 4 ...
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