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What is the elapsed time in days from the first day of summer to the first day of winter?

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06/14/2015

From 1900 to 2150, the average length of time per year from the beginning of the northern hemisphere summer to the beginning of the northern hemisphere winter is 183.52 days, and the average length of time per year from the beginning of the southern hemisphere summer to the beginning of the southern hemisphere winter is 181.72 days. The reason that northern hemisphere summers are longer than southern hemisphere summers is that Earth is closest to the sun, at its perihelion, in January, and it's farthest from the sun, at its aphelion, in July, and orbiting bodies always travel faster when they're closer to the body they're orbiting.