nocturnal arc
noun Astronomy.
the portion of the diurnal circle that is below the horizon of a given point.
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Nearby words
noctuid, noctule, nocturia, nocturn, nocturnal, nocturnal arc, nocturnal emission, nocturnal enuresis, nocturnal myoclonus, nocturnally, nocturne
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. 2019