Of or pertaining to the occult.

(astronomy) The passage of the Moon, as it moves through the nighttime sky, in front of a celestial object, such as a star or planet.

plural of lunar occultation

plural of occulting light

A light in which the total duration of light in each period is clearly longer than the total duration of darkness and in which the intervals of darkness (occultations) are all of equal duration.

plural of occult line

A line drawn as a part of the construction of a geometrical figure or problem, but not to appear in the finished plan.