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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]
Civil dawn is preceded by morning nautical twilight and civil dusk is followed by evening nautical twilight. Civil twilight in a small town in the Mojave Desert. Under clear weather conditions, civil twilight approximates the limit at which solar illumination suffices for the human eye to clearly distinguish terrestrial objects.
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.
The blue shark (Prionace glauca) is a predator that primarily hunts during the pre-dawn to dawn period. [5] During matutinal hours, they spend more time than any other point in the day at the surface of the ocean. [5] It is likely that they are taking advantage of the increased density of prey at the water's surface during dawn. [6]
Dangerous Flights is a documentary-style reality television show that airs on the Discovery Channel. The show follows the pilots of C.B. Aviation as they ferry light aircraft to their new owners across distances the aircraft weren't designed to fly and often over routes that are generally considered to be dangerous by the aviation community. [1]
In Islam, Zodiacal Light (or "false dawn") is referred to as False Morning (Subhe-Kazeb, Persian صبح کاذب) and Astronomical dawn is called Sahar (سحر) or True Morning (Subhe-Sadeq, Persian صبح صادق), and it is the time of first prayer of the day, and the beginning of the daily fast during Ramadan.
There are two distinct activity peaks termed the M (for morning) peak, happening at dawn, and E (for evening) peak, at dusk. They monitor the different day lengths in different seasons of the year. [30] The light-sensitive proteins in the eye called, rhodopsins (rhodopsin 1 and 6), are crucial in activating the M and E oscillations. [31]
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 ...