in astronomy, the distance of any celestial object from the equinoctial, either northward or southward. It is either true or apparent, according as the real or apparent place of the object is considered. See ASTRONOMY, No. 409, 410.

DECLINATION of the Sea-Compass or Needle, is its variation from the true meridian of any place.

DECLINATION of a Wall or Plane, for Dials, is an arch of the horizon, contained either between the plane and the prime vertical circle, if you reckon it from the east or west; or else between the meridian and the plane, if you account it from the north or south. See DIAL.