nocturnal arc

nocturnal arc

noun Astronomy.
the portion of the diurnal circle that is below the horizon of a given point.
Compare diurnal arc.


Origin:
1695–1705
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Nocturnal arc is always a great word to know.
So is star. Does it mean:
a celestial body with a mass of gas that is hot enough to produce and sustain nuclear fusion, thus producing luminosity
the magnitude of a star as it would appear to a hypothetical observer at a distance of 10 parsecs or 32.6 light-years
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