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celestial equator
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The
celestial
equator is the equator of the
astronomical
sky. It is the projection of the earth's equator onto the
celestial sphere
. If you are standing on earths equator and look directly overhead you are looking at the celestial equator.
The celestial equator is zero degrees of
declination
in the sky. As you go to the north the
declination
increases to 90 degree's which is directly overhead at the north pole. As you go south the
declination
decreases to -90 which is directly overhead at the south pole.
This system of declination starting at the celestail equator is the one which most current day astronomers use to chart stars in the sky.
NOTE: While all stars have fixed relations to the celestial equator, the suns position realitive to the celestial equator changes over the course of a year due to the 23.5 degree tilt of the earths axis realitive to its orbit.
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chaos
astronomical
The formation of interstellar objects
Declination
Stellar Description
Analemma
summer
tropical year
anomalistic year
Lunar standstill
Celestial pole
equator
Fantastic Planet
autumnal equinox
Northern Bushel
Sidereal
Zodiac
Horoscope
Cetus
Astronomy
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