Occultation /(?)/

Oc·cul·ta·tion

Occultation

n.
  1. The hiding of a heavenly body from sight by the intervention of some other of the heavenly bodies; -- applied especially to eclipses of stars and planets by the moon, and to the eclipses of satellites of planets by their primaries. (Astron.)
  2. The state of being occult. (Fig.:)
    The reappearance of such an author after those long periods of occultation.
    — Jeffrey.

Phrases & Compounds
Circle of perpetual occultation
See under Circle.