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Exam 1

Planetary Astronomy

TermDefinition
Relative stellar coordinates altitude and azimuth
altitude distance above the horizon measured in degrees
azimuth distance along the horizon measured in degrees from due north
zenith 90 degrees
one degree altitude width of your pinky
five degrees altitude width of three fingers
ten degrees altitude width of your fist
fifteen degrees altitude width of stretched index and pinky finger
twenty-five degrees altitude width of stretched thumb and pinky finger
zero degrees azimuth north
ninety degrees azimuth east
one-hundred and eighty degrees azimuth south
two-hundred and seventy degrees azimuth west
absolute stellar coordinates declination and right ascension
declination a measure above or below the celestial equator measured in degrees
right ascension a measure along the celestial equator measured in hours, minutes, and seconds
celestial equator a line running due east to due west across the sky
ecliptic the sun's annual path across the background stars
summer solstice the point where the sun is highest along its path
winter solstice the point where the sun is lowest along its path
equinox the point where the sun's path crosses the celestial equator
seasonal progression the sun's tilted path through the sky with respect to the celestial equator at an angle of 23.5 degrees
solar eclipse moon blocks the sun (only during new moon)
lunar eclipse moon moves into earth’s shadow (only during full moon)
diurnal motion how all objects in the heavens appear to move from east to west across the sky
gregorian calendar 365.2425 days in a year
metonic cycle a period of 19 years where the new/full moons return to the same days of the year
Created by: sophcm123
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