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21 June, 17:42

A plane has an altitude of 23760 feet which expression can I use to find the altitude in miles

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  1. 21 June, 17:45
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    Perhaps we can treat this as a "distance to horizon" problem, the observer is 7 mi above the earth

    One formula is: d+=+sqrt%28%283h%29%2F2%29 where d is in miles and h is in feet

    Change 7 mi; 5280*7 = 36960 ft

    so we have

    d = sqrt%28%283960%2A3%29%2F2%29

    d ~ 235.5 mi

    looking in opposite directions a total of 2*235 = 471 mi can be viewed

    Find the circumference of the earth

    C = pi%2A8000

    C = 25133 mi

    :

    The arc: 471%2F25133 * 360 = 6.7 degrees

    :

    This should be pretty close, because the earth is so large compared to the altitude. would appreciate if it you would let me know. C
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