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Twilight occurs according to the solar elevation angle θ s, which is the position of the geometric center of the Sun relative to the horizon. There are three established and widely accepted subcategories of twilight: civil twilight (nearest the horizon), nautical twilight, and astronomical twilight (farthest from the horizon).
Sunset (or sundown) is the disappearance of the Sun at the end of the Sun path, below the horizon of the Earth (or any other astronomical object in the Solar System) due to its rotation. As viewed from everywhere on Earth, it is a phenomenon that happens approximately once every 24 hours, except in areas close to the poles .
Rather, blue hour refers to the state of natural lighting that usually occurs around the nautical stage of the twilight period (at dawn or dusk). [3] The blue hour is shorter in regions near the equator due to the sun rising and setting at steep angles. In places closer to the poles, the illumination and twilight periods are longer as the sun ...
In addition, some "ghost" suns are visible below the horizon, as much as 18° down, during which twilight occurs. The pictures can be used for both the northern and the southern hemispheres of Earth. A theoretical observer is supposed to stand near the tree on a small island in the middle of the sea. The green arrows represent the cardinal ...
Sunrise, sunset, or sun position for any location – U.S. only Sunrise, sunset and day length for any location – Worldwide Rise/Set/Transit/Twilight Data – U.S. only
The Sun over Phang Nga Bay in Thailand (), at 7:00 a.m. local time on a March morning. The position of the Sun in the sky is a function of both the time and the geographic location of observation on Earth's surface.
Near the summer solstice, latitudes higher than about 54°34′ get no darker than nautical twilight; the "darkness of the night" varies greatly at these latitudes. [citation needed] At latitudes higher than about 60°34′, summer nights get no darker than civil twilight. This period of "bright nights" is longer at higher latitudes. [citation ...
Crepuscular rays, sometimes colloquially referred to as god rays, are sunbeams that originate when the Sun appears to be just above or below a layer of clouds, during the twilight period. [1] Crepuscular rays are noticeable when the contrast between light and dark is most obvious. Crepuscular comes from the Latin word crepusculum, meaning ...