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Some crepuscular animals may also be active by moonlight or during an overcast day. 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 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 ...
Crepuscular, a classification of animals that are active primarily during twilight, making them similar to nocturnal animals. Diurnality, plant or animal behavior characterized by activity during the day and sleeping at night. Cathemeral, a classification of organisms with sporadic and random intervals of activity during the day or night.
Birds flying before dawn over the Maasai Mara Matutinal activity occurs in the twilight period from dawn to sunrise. Matutinal, matinal (in entomological writings), [1] [2] and matutine are terms used in the life sciences to indicate something of, relating to, or occurring in the early morning.
Most of the book is set in Saro City, which is situated near a large forest with trees, bushes, and graben (scavenger animals). As stated in the book's introduction, the weather in the book is often appropriate to the mood swings of the characters in the book, and the region of Saro City receives rains that last several days.
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).
Darkwing (known as Dusk in the United Kingdom) is a 2007 young adult fantasy novel by Canadian author Kenneth Oppel. It is the prequel and fourth book of the Silverwing series, and takes place 65 million years before the events of the first book. It describes the origins of the war between the birds and the beasts.
The western twilight sky after sunset, during the blue hour (around nautical dusk).The deep-blue color of the upper portion is attributable to Chappuis absorption. Chappuis absorption (French:) refers to the absorption of electromagnetic radiation by ozone, which is especially noticeable in the ozone layer, which absorbs a small part of sunlight in the visible portion of the electromagnetic ...