in Astronomy, the distance of any celestial object from the equator, northward or southward. It is either true or apparent, according as the real or apparent place of the object is considered. See Astronomy, vol. iv., p. 2.

DECLINATION of the Compass or Needle, is its variation from the true meridian of a place.

DECLINATION of a Plane or Wall, in Dialling, an arc of the horizon contained between the plane and the prime vertical circle, reckoning from east to west, or between the meridian and the plane, reckoning from north to south. See Dialling.