sinusoidal equation

In prince albert saskactchewan the sun rises at 09:17 on december 21 and at 04:35 on june 22. because there is no daylight savings time in sask. the time the sun rises on any other date can be predicted from a sinusoidal graph with a period of 365 days

write a sinusoidal equation that relates the time the sun rises to the day of the year.

I think you get the amplitude by the difference between the two times (in minutes or seconds) because they are the latest and earliest sunrises.

Then you are given the period 365 days

And that you have a sinusoidal

Maybe you need to determine a phase shift as well.