Daylight function for 40° N Verify that the function
has the following properties, where t is measured in days and D is the number of hours between sunrise and sunset.
- a. It has a period of 365 days.
- b. Its maximum and minimum values are 14.8 and 9.2, respectively, which occur approximately at t = 172 and t = 355, respectively (corresponding to the solstices).
- c. D(81) = 12 and D(264) ≈ 12 (corresponding to the equinoxes).
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