diurnal arc

noun

Definition of diurnal arc

: the portion of the diurnal circle of a celestial body that is above the observer's horizon the diurnal arc of the sun is its apparent path from sunrise to sunset

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“Diurnal arc.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/diurnal%20arc. Accessed 29 Nov. 2020.

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