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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

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

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

From Project Gutenberg

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.