unit one questions

unit one questions - c Three months after the first day of...

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1. a. The stars and planets seen at midnight will move along a circular arc westward and new stars, not previously visible, will appear out of the east. The pivot points of the celestial sphere are the north and south celestial poles, which are located directly above the Earth’s north and south poles (p 20). Polaris is located directly above the North Pole, and only moves slightly; other stars circle Polaris. Circumpolar constellations, such as the Big Dipper, never rise or set; they circle Polaris (p 21). The stars will fade as the sun becomes visible. b. The Earth moves around the sun 360.25* each year. Each day, the earth moves about 1*, so anything (a star or a planet) will appear in the same place the next night, about 24 hours minus 1* worth of time (approx. 4 minutes). Therefore, it will take a star on the meridian 23 h 56 m 4.091. http://en.wikipedia.org/wiki/Earth_rotation#Rotation_period
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Unformatted text preview: c. Three months after the first day of class, the Earth will have moved ¼ of the way around the sun. The celestial sphere spins 360* around the sun to make a full rotation, therefore, the celestial sphere will have spun 90*, shifting the stars on the celestial equator 90* westward. http://en.wikipedia.org/wiki/Celestial_sphere 2. The next total lunar eclipse is 03/03/07 (p 35). If you were on the moon during an eclipse, you would have trouble viewing solar prominences, because the sun would be eclipsed by the Earth. Therefore, it would not receive direct sunlight. The moon would receive some light bent from the Earth’s atmosphere (p 34). Washington observes fewer lunar eclipses, because of the angle of the sun (it is never directly overhead, and stays very low in the winter months)....
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