Significant Times of Day

Over the course of any 24 hour day, the world transitions from the darkness of night to the brightness of day, and then back again. As the Sun arcs its way through the sky during that process, it crosses a number of thresholds and reaches certain maxima that have long influenced man's activities, even today. This article discusses those particular times of day that have some solar significance, which include different stages of twilight, sunrise and sunset, as well as local and solar noon.

Natural Frequency