Knowing North: - Exploratorium
The earth makes one complete turn, or spin, every 24 hours. A complete spin is 360 degrees. Since it spins through 360 degrees of angle in 24 hours, the earth’s rate of rotation is 360 degrees ÷ 24 hours, which equals 15 degrees per hour. A shadow’s angle away from north changes at that same steady rate. Going Further ................
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