51Թ

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nocturnal arc

noun

Astronomy.
  1. the portion of the diurnal circle that is below the horizon of a given point.
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51Թ History and Origins

Origin of nocturnal arc1

First recorded in 1695–1705
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Example Sentences

Examples have not been reviewed.

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

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