Tide height as a function of time resembles a sinusoidal function during the time between low and high tide.
At one such location on another planet with water, the tide has a high of 12.7 feet at 2 am and then the next low is -0.8 feet at 11 am (9 hours later).
Find a formula for a sinusoidal function H(t) that gives the height t hours after midnight.