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| the study of the universe |
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| distance traveled by light in a year |
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| stars into configurations |
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| a canopy of stars resembling an astronomical painting on a heavenly ceiling contains all the stars |
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| apparent daily rotation of the celestial sphere due to Earth's rotation on its axis |
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| the points where Earth's axis intersect the celestial sphere sphere |
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| the point on the C.S. directly above Earth's North Pole |
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| point on the C.S. directly above Earth's South Pole |
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| represents the intersection of Earth's equatorial plane with the celestial sphere |
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| Celestial equator divides C.S. into two halves |
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| the North Celestial Hemisphere and the South Celestial Hemisphere |
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| At the North Pole, the NCP appears directly overhead |
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| the point on the celestial sphere directly over your head |
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| stars near the NCP seem to never set |
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| stars near C.E. seem to rise in east and set in west |
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| line running from the NCP to your zenith to SCP to your nadir back to NCP |
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| time when Sun is on the LCM |
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| hour angle of the Sun with the LCM |
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| hour angle of the vernal equinox with the LCM |
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| motion of the Sun on the sky traces out a path on the celestial sphere |
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| the point on the ecliptic where the Sun is at its northernmost point above the celestial equator |
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| the shortest day in Earth's Northern Hemisphere and the longest in the Sourthen Hemisphere |
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| occurs in the southern autumn |
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| occurs in the northern spring |
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| angle between the object and a point on the horizon directly beneath the object |
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| angle between the point on the horizon directly beneath the object and north |
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| angle of an object north or south of the C.E. |
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| angle of an object eastward from the Vernal Equinox |
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| Star charts are marked by their |
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| caused by torques on Earth due to the gravitational pulls of the Moon and the Sun |
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| Sun and Moon line up precisely as seen from Earth |
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| Sun and Moon are in exactly opposite directions; full moon |
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| never completely covers the Moon |
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| entire lunar surface is obscured |
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| Moon passes directly in front of the Sun |
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| the Moon falls to completely hide the Sun |
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| the apparent displacement of a foreground object relative to the background as the observer's location changes |
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| equal to the distance between the Earth and the Sun |
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| 6 hours before sunset (noon) |
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