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Daylength

Daylength For sunrise and sunset, ? = 90 ? , so cos? = sin? sin? + cos? cos? cos? becomes cos? = -tan? tan? Daylength = 2 cos -1 (-tan? tan?) What is the daylength at Fairbanks, Alaska (65 ? N, 148 ? W) at the winter solstice? Daylength = 2 cos -1 (-tan(65 ?) tan(-23.5 ? ))

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Daylength