celestial equator

The second is the great watersnake, Hydra, which 4600 years ago stretched for 105° along the celestial equator of that day.

The Declination of a star is its angular distance north or south of the celestial equator.

The angle of elevation of the celestial equator to the horizon varies according to the position of the observer.

Then the zenith would be on the celestial equator and the north and south poles of the heavens would be on the horizon.

When the sun is south of the celestial equator its apparent daily path is the same as it would be for a star so situated.