Problem
The number of hours daylight, D(t) at a particular time of the year can be approximated by
$D(t) = \dfrac{K}{2}\sin \left[ \dfrac{2\pi}{365}(t - 79) \right] + 12$
for t days and t = 0 corresponding to January 1. The constant K determines the total variation in day length and depends on the latitude of the locale. When is the day length the longest, assuming that it is NOT a leap year?
| A. December 20 |
C. June 20 |
| B. June 19 |
D. December 19 |
Answer Key
