Celestial Coordinate System , Earth Coordinate System – Astronomy
Celestial Coordinate System
Celestial sphere, Celestial equator, vernal equinox, terrestrial sphere, South celestial pole, North celestial pole, declination, ecliptic, right ascension, celestial meridian
Earth Coordinate System
Arctic Circle, laitude, tropic of Cancer, equator, tropic of Capricorn, longitude, Antarctic Circle, North Pole, Northern hemisphere, Southern hemisphere , South Pole.