Ch 4 Earth, Moon, & Sky

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Astronomy

Last updated 9:48 PM on 9/15/22
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24 Terms

1
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Great circles
any circle on the surface of a sphere whose center is at the center of the sphere
2
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Meridian
series of great circles that pass through both N & S poles
series of great circles that pass through both N & S poles
3
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Declination
Latitude of the celestial sphere
Latitude of the celestial sphere
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Declination N of the celestial equator
0 to +90 degrees
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Declination S of the celestial equator
0 to -90 degrees
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Right ascension
Longitude of the celestial sphere
Longitude of the celestial sphere
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Vernal equinox
"prime meridian" of the celestial sphere, positioned where the ecliptic meets the celestial equator
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Right ascension units
0 to 24 hr or 0 to 360 degrees
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Equinox
Both hemispheres are getting equal light
Both hemispheres are getting equal light
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Solstice
1 hemisphere is pointed towards the Sun
1 hemisphere is pointed towards the Sun
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Why does the tilt create seasons?
Cuz in summer the sunlight hits Earth more directly and the sun spend more time in the sky
Cuz in summer the sunlight hits Earth more directly and the sun spend more time in the sky
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Where is the Sun on the summer solstice if you were on the Tropic of Cancer?
at your zenith
at your zenith
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How long is the Sun in the sky on the summer solstice if you were on the Arctic circle?
24 hrs
24 hrs
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How long is the Sun in the sky on the summer solstice if you were on the Antarctic circle?
0 hrs
0 hrs
15
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How many moon phases are there?
8
16
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How many degrees does the moon shift each day?
12
17
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At what phase does the moon rise at sunrise and set at sunset?
New moon
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At what phase does the moon rise at noon and set at midnight?
1st quarter
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At what phase does the moon rise at sunset and set at sunrise?
Full moon
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At what phase does the moon rise at midnight and set at noon?
3rd quarter
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How long is solar month?
27.3 days
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How long is sidereal month?
29.5 days
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Synchronous rotation
the moon rotates on its axis in exactly the same time that it takes for it to revolve around the Earth
the moon rotates on its axis in exactly the same time that it takes for it to revolve around the Earth
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Does the distance between the Sun and the Earth determine the season?
No