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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]
Sungazing is the unsafe practice of looking directly at the Sun.It is sometimes done as part of a spiritual or religious practice, most often near dawn or dusk. [1] The human eye is very sensitive, and exposure to direct sunlight can lead to solar retinopathy, pterygium, [2] cataracts, [3] and potentially blindness.
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]
Image credits: Ross Burgener Meanwhile, for Dr. Brandon, the most beautiful natural phenomenon is the northern lights, whereas the most fascinating is the diel vertical migration.
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.
One morning, I’m at the park-and-ride and writing. The sun is bright and it’s a warm day for February. I hang my black rain jacket in the window to block the sun from shining on the computer ...
These ones from Sunbeam are made with a color-changing LED light that automatically turns on from dusk to dawn for everyday use or can be set to only come on with motion. ... It can detect humans ...
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.