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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.
The dawn chorus is the outbreak of birdsong at the start of a new day. In temperate countries this is most noticeable in spring when the birds are either defending a breeding territory, trying to attract a mate or calling in the flock. In a given location it is common for different species to do their dawn singing at different times.
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]
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.
Twilight is the time period between dawn and sunrise, and between sunset and dusk. Morning twilight: astronomical, nautical, and civil stages at dawn. The apparent disk of the Sun is shown to scale. [1] Evening twilight: civil, nautical, and astronomical stages at dusk. The solar disk is shown to scale.
It was a September morning in 2020, and Deni Seymour, an archeologist, was searching for artifacts along the Santa Cruz River near Nogales, Arizona. ... A troubled townsite and a dawn attack.
It is based on the reddish glow of the morning or evening sky, caused by trapped particles scattering the blue light from the sun in a stable air mass. [5] If the morning skies are of an orange-red glow, it signifies a high-pressure air mass with stable air trapping particles, like dust, which scatters the sun's blue light.
Aerial view of the crowd gathered outside the White House to attend Franklin D. Roosevelt's 4th Inaugural speech on January 20, 1945, in Washington D.C. Light snow ended around 9 a.m. that morning ...