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Miscellaneous announcements… Get started on your first observing project. Anyone interested in the astrophotography project? No class Monday (happy Labor Day). First homework is due Wednesday.
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The Stars from Different Latitudes 1 September 2006
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Today: How the stars change as you move to different latitudes on earth Using the stars to measure the size of the earth
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From other locations… Longitude (E-W location) doesn’t matter, except to determine time of day Latitude matters: For every 70 miles traveled north, northern stars get 1º higher, southern stars 1º lower So a 360º shift would presumably take 360 x 70 miles, or 25,000 miles: the earth’s circumference!
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The Two-Sphere Universe The earth is a much smaller sphere at the center of the celestial sphere. As you move around on the earth, your horizon changes orientation so you see a different half of the celestial sphere. This model dates back to ancient Greece, 2500 years ago.
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Alpha, beta Centauri, Crux
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Orion setting in Hawaii
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Dippers from Hawaii
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Kilimanjaro star trails (3º S)
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Southern hemisphere star trails
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