Variation With Time
Shadow length when caused by the sun changes dramatically throughout the day. The length of a shadow cast on the ground is proportional to the cotangent of the sun's elevation angle—its angle θ relative to the horizon. Near sunrise and sunset, when θ = 0° and cot(θ) is infinite, shadows can be extremely long. If the sun passes directly overhead, then θ = 90°, cot(θ)=0, and shadows are cast directly underneath objects.
Read more about this topic: Shadow
Famous quotes containing the word time:
“Yelburton: After you work with a man a certain length of time you come to know his habits, his values. You come to know him. And either he’s the kind who chases after women or he’s not.
J.J. Gittes: Mulwray isn’t?
Yelburton: He never even kids about it.
J.J. Gittes: Well, maybe he takes it very seriously.”
—Robert Towne (b. 1936)