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perpetual day

noun
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Definition of perpetual day

: the period of nearly six months alternately at the earth's north and south poles when the sun does not set — compare perpetual night

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“Perpetual day.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/perpetual%20day. Accessed 28 Feb. 2021.

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