Ch 2 Observing the Sky
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Last updated 8:56 PM on 9/15/22
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18 Terms
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Geocentric
Earth at the center of the universe
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Celestial sphere
circle around Earth that is our night sky
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Zenith
Right over your head, 90 degrees N
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Horizon
Where the sky meets the ground, 360 degrees around you
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Celestial equator
90 degrees from the celestial poles, projection of the Earth's equator
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Celestial poles
Projection of Earth's poles, in the same place
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North circumpolar zone
stars within 38 degrees of the N celestial pole, part of the sky that never sets if your in the N hemisphere
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South circumpolar zone
stars within 38 degrees of the S celestial pole, part of the sky that never rises if your in the N hemisphere
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Polaris
Star that is closest to the north celestial pole, North Star
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Ecliptic
the path the sun appears to take around the celestial sphere
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Sun rises about __ min later each day
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The ecliptic (does/doesn't) lie along the celestial equator
doesn't
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Fixed stars
the stars that seem to maintain a fixed pattern in the sky
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Wandering stars
the planets and moon that seem to move across the sky
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Speed = ____ ÷ ____
distance ÷ time
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Zodiac
18 degree belt that the individual paths of the moon & planets all fall within, close to the ecliptic
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Constellations
88 sectors that we've divided the sky into
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Asterism
indicator of especially noticeable star pattern within a constellation
