Celestial Phenomena

Celestial Phenomena - • Earth’s atmosphere refracts the...

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Celestial Phenomena Scientific uses of eclipses o The first to provide evidence for Einstein’s theory of general relativity Contributed to “gravity sheet” idea of space, mass warps of space and time o If you have two distant stars their apparent positions are far off from their true positions Light is bent by the sun as it comes towards Earth Allowed scientists to take a picture of the sky during the day and compare them to pictures taken of the same area of the sky at night Arthur Eddington -1919- measured the apparent positions of stars during solar eclipes Results roughly agreed with Einstein’s predictions Subsequesnt tests also consistent with theory Light is bent by the gravity of the sun Moon is not completely dark during n eclipse
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Unformatted text preview: • Earth’s atmosphere refracts the red light, but blue and green are absorbed and scattered • Earth’s atmosphere bends the light, allowing it to hit the moon • “total” lunar eclipse • A crecscent moon – looking back on the earth you would see a gibbous Earthshine – light gets reflected off the earth, goes to the moon, then comes back to the earth Eclipses don’t occur every month because of the 5 degree angle between Moon/Earth plane and Sun/Earth plane Earthshine reduces as moon progresses in its orbit because less of the Earth is seen from the Moon’s perspective o Our View of the Sky Celestial sphere • Everything looks like it’s on a dome that rotates around us • As Earth rotates, stars move across the sky...
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