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17 June, 13:20

The sun always illuminates half of the moon's surface, except during a lunar eclipse. the illuminated portion of tge moon visible from earth varies as it revolves around the earth resulting in the phases of the moon. the period from a full moon to a new moon and back to a full moon is called a synodic month and is 29 days, 12 hours, and 44.05 minutes long. write a sine function that models the fraction of the moon's surface which is seen to be illuminated during a synodic month as a function of the number of days, d, after a full moon.

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  1. 17 June, 14:50
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    We are given the period of the function which is

    29 days, 12 hours, and 44.05 minutes or 29.5306 days

    If we let

    s be the fraction of the moon's surface seen

    M be half of the moon's surface

    The sine function is

    s = M sin b θ

    T = 2 π / b

    b = 2π / 29.5306

    s = M sin 2πθ / 29.5306
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