The path of the setting sun makes an angle with the horizon that varies directly with latitude. At the equator (latitude 0°) the sun’s path is perpendicular to the horizon, while near Boston (latitude 42°N) the sun’s path makes a 48° angle. The angle stays the same throughout the year; the point of intersection (sunset) varies and is furthest south at the winter solstice.
December 2, 1999 at Carlisle Cranberry Bog
Nikon F3, 50mm, on Kodachrome 25
Multiple exposures at ten-minute intervals: f/22, 1/250 sec, with 9-stop neutral density attenuator
Final exposure at sunset: f/22, 1/4 sec