Answer the following questions in the essay box below:

Locate the lowest and highest points on your graph. What is the amplitude?
There are 365 days in a year. Explain this value’s relationship to the graph.
What is the vertical shift of the graph?
What is the phase shift of the graph?
Write a sinusoidal function that models the number of daylight hours for the year in this city.
Using your equation, estimate the number of daylight hours in this city on the 220th day of the year. Based on your graph, does this answer seem reasonable? Explain any discrepancy that might occur between the two values.

Get sunrise and sunset times at the Astronomical Applications Department of the U.S. Navy.