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26 Cards in this Set
- Front
- Back
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Tropic of Cancer
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23 degrees North, where sunlight hits the the earth most directly during north hemisphere summer
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Tropic of Capricorn
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23 degrees South, where the sunlight hits the earth most directly during north hemisphere winter
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constellation
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region of the sky with well defined borders
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north celestial pole
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the point directly over Earths North Pole.
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south celestial pole
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the point directly over Earths South Pole.
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Vernal (Spring) Equinox
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solstice/equinox March 21
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Autumnal (Fall) Equinox
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solstice/equinox Sept 21
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Summer Solstice
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solstice/equinox June 21
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Winter Solstice
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solstice/equinox Dec 21
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zenith
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The point directly overhead
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max altitude of celestial equator
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90 deg (max alt CE at equator) - latiude
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max altitude of celestial object
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max alt CE + declination of object
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umbra
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area where sunlight is completely blocked by eclipsing object
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prenumbra
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area where sunlight is partially blocked by eclipsing object
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saros cycle
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18 years and about 12 days, the time between eclipses.
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How do you determine the Altitude of the Celestial North Pole given your Lat/Long?
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Celestial North Pole = Your Latitude
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How do you determine the Max Alititude of the Celestial Equator given your Lat/Long?
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Max Alt Celestial Equator = 90 degrees - your Lat
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How do you determine the Max Alititude of an Object in the sky given your Lat/Long and Right Ascension and Declination?
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Max Alt of an Object in the Sky = 90 deg - your Lat + Declination
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What is the Declination of the Sun during the Summer Solstice?
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+23.5 deg
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What is the Declination of the Sun during the Winter Solstice?
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-23.5 deg
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What is the Declination of the Sun during the Vernal Equinox?
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0 deg
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What is the Declination of the Sun during the Autumnal Equinox?
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0 deg
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What is the Sun's Right Ascension on March 21?
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0 hours
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What is the Sun's Right Ascension on June 21?
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6 hours
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What is the Sun's Right Ascension on Sep 21?
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12 hours
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What is the Sun's Right Ascension on Dec 21?
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18 hours
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