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diurnal arc

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noun Astronomy.

the portion of the diurnal circle that is above the horizon at a given point.

Compare nocturnal arc.

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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Diurnal arc is always a great word to know.

So is rotation. Does it mean:

the movement or path of the earth or a heavenly body turning on its axis

marking the time when the sun is at the north most point from the celestial equator occurring around June 21

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