• synonyms

nocturnal arc

See more synonyms for nocturnal arc on Thesaurus.com
noun Astronomy.
  1. the portion of the diurnal circle that is below the horizon of a given point.
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Compare diurnal arc.

Origin of nocturnal arc

First recorded in 1695–1705
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018