How do you determine the angle of sunlight?
At noon, this angle is given by
Defining angle of sunlight as angle of incidence of light rays
from Sun, this angle is the angle 'a' that the sunlight-direction makes
with the vertical. When sunlight strikes right from overhead, a = 0.
At sunrise and sunset on any day, sunlight strikes horizontally. So,
this angle is
At noon ( the instant midway between sunrise and sunset), this angle
is minimum, and correspondingly, the length of your shadow is
If you measure the length of the shadow at noon as L against your
Of course, this varies between