The Collaborative International Dictionary of English v.0.48:

South \South\, v. i. [imp. & p. p. Southed; p. pr. & vb. n.
   Southing.]
   1. To turn or move toward the south; to veer toward the
      south.
      [1913 Webster]

   2. (Astron.) To come to the meridian; to cross the north and
      south line; -- said chiefly of the moon; as, the moon
      souths at nine.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Southing \South"ing\ (?; 277), n.
   1. Tendency or progress southward; as, the southing of the
      sun. --Emerson.
      [1913 Webster]

   2. The time at which the moon, or other heavenly body, passes
      the meridian of a place.
      [1913 Webster]

   3. (Astron.) Distance of any heavenly body south of the
      equator; south declination; south latitude.
      [1913 Webster]

   4. (Surv. & Navigation) Distance southward from any point
      departure or of reckoning, measured on a meridian; --
      opposed to northing.
      [1913 Webster]