D defs.my
Entry 4 senses Webster, 1913

Southing

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