\South"ing\ (?; 277), n.
1. Tendency or progress southward; as, the southing of the
   sun. --Emerson.
2. The time at which the moon, or other heavenly body, passes
   the meridian of a place.
3. (Astron.) Distance of any heavenly body south of the
   equator; south declination; south latitude.
4. (Surv. & Navigation) Distance southward from any point
   departure or of reckoning, measured on a meridian; --
   opposed to {northing}.