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Astronomy Week 2

TermDefinition
constellation region of the sky with well-defined borders
celestial sphere all stars appear to lie on it, but in reality they lie at different distances from Earth. We lack depth perception to perceive distance differences.
north celestial pole directly over Earth's North Pole
south celestial pole directly over Earth's South Pole
celestial equator projection of Earth's equator into space; makes a complete circle around the celestial sphere
ecliptic path the Sun follows as it appears to circle around the celestial sphere once each year. It crosses the celestial equator at a 23.5 degree angle, bc that is the tilt of the Earth's axis
Milky Way band of light, traces our galaxy's disk of stars (the galactic plane) as it appears from our location within the galaxy. Our view in all directions into the disk of our galaxy.
local sky seen from wherever you happen to stand. Appears as a dome, not whole sphere, bc of our perspective.
horizon boundary between Earth and sky
zenith point directly overhead
meridian imaginary half-circle stretching from the horizon due south, through the zenith, to the horizon due north
angular size smaller if farther away; angle an object appears to span in your field of view
angular distance angle that appears to separate a pair of objects in the sky
arcminutes ', we divide each degree into 60
arcsecond '', we divide each arcminute into 60
circumpolar always above the horizon
latitude measures N-S position on Earth. 0 degrees at equator, 90 degrees N at North and 90 degrees S at South. The altitude of the celestial pole in your sky is equal to your latitude.
longitude measures E-W position on Earth. 0 degrees along prime meridian (Greenwich)
zodiac 13 constellations along the ecliptic
Created by: mglen
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