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Showing results for nocturnal arc. Search instead for Nocturnal+Animals.

nocturnal arc

American  

noun

Astronomy.
  1. the portion of the diurnal circle that is below the horizon of a given point.


Etymology

Origin of nocturnal arc

First recorded in 1695–1705


Example Sentences

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See Examples For:

The diurnal arc is described during the daytime, the nocturnal arc during the night.

From Webster's Unabridged Dictionary by Noah Webster

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