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26 September, 22:03

Astronomy: At is closest approach, Mars is about 5.6X10^7 km from Earth and its apparent size is about 0.00012 radians. What is the approximate diameter of Mars?

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  1. 26 September, 22:28
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    1.) D = 2pi * d * A / 360 degrees; Where:

    pi = 3.14;

    d = distance or 56,000,000 km (5.6x10^7 to standard notation)

    A = angular size in degrees or. 00688 degrees (.00012 radian to degrees)

    D = 2 (3.14) * 56,000,000 *.00688 / 360

    = 6.28 * 385,280 / 360

    = 2,419,558.4 / 360

    D = 6,720.996 or 6,721

    Therefore, 6,721 km. is the approximate diameter of Mars.
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