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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).
The time of dusk is the moment at the very end of astronomical twilight, just before the minimum brightness of the night sky sets in, or may be thought of as the darkest part of evening twilight. [4] However, technically, the three stages of dusk are as follows: At civil dusk, the center of the Sun's disc goes 6° below the horizon in the ...
Matutinal animals are active only after dawn, and vespertine only before dusk. A number of factors affect the time of day an animal is active. Predators hunt when their prey is available, and prey try to avoid the times when their principal predators are at large. The temperature may be too high at midday or too low at night. [2]
Dawn begins with the first sight of lightness in the morning, and continues until the Sun breaks the horizon. The morning twilight is divided in three phases, which are determined by the angular distance of the centre of the Sun (degrees below the horizon) in the morning.
Blue hour at the Old Cathedral of the Holy Name of Jesus, Bragança in Portugal. The blue hour (from French l'heure bleue; [1] [a] pronounced [lœʁ blø]) is the period of twilight (in the morning or evening, around the nautical stage) when the Sun is at a significant depth below the horizon.
Suhur, sahur, or suhoor (UK: / s ə ˈ h ɜːr /; [1] Arabic: سحور, romanized: suḥūr, lit. 'of the dawn', 'pre-dawn meal'), also called sahari, sahri, or sehri (Persian: سحری) is the meal consumed early in the morning by Muslims before fasting (), before dawn during or outside the Islamic month of Ramadan. [2]
Shahar "Dawn" is a god in Ugaritic and Canaanite religion first mentioned in inscriptions found in Ugarit (now Ras Shamra, Syria). [1] William F. Albright identified Shalim as the god of the dusk and Shahar as the god of the dawn. [2] Shahar and Salim are the twin children of El. As the markers of dawn and dusk, Shahar and Shalim also ...
Zodiacal light seen behind the Submillimeter Array from the summit of Mauna Kea. In the mid-latitudes, the zodiacal light is best observed in the western sky in the spring after the evening twilight has completely disappeared, or in the eastern sky in the autumn just before the morning twilight appears.