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13 June, 09:40

The Sun appears to be about 0.5° in diameter. On the equator, approximately how long does it take for the Sun to set, from first contact with the horizon to complete disappearance below the horizon?

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  1. 13 June, 10:43
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    It takes about 2 minutes for the sun to completely disappear below the horizon.

    Explanation:

    Earth's rotation in a day = 360 degrees

    Sun's Diameter = 0.5 degrees

    360/24hr = Earth's rotation is 15 degrees/hour

    If the sun's diameter is 0.5 degrees it takes:

    15/0.5=30

    60/30 = 2 minutes (since there are 60 minutes in an hour)
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