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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 ...
Inuit use the Moon to keep track of the 'calendar year', counting thirteen "moon months." Each month is named for a predictable seasonal characteristic, mostly related to animal behavior, which coincide with a particular moon. For example, one month is called "the nesting of eider ducks" while another is called "the birth of seal pups."
The distinction is not absolute, because crepuscular animals may also be active on a bright moonlit night or on a dull day. Some animals casually described as nocturnal are in fact crepuscular. [2] Special classes of crepuscular behaviour include matutinal, or "matinal", animals active only in the dawn, and vespertine, only in the dusk.
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).
Alternatively, Jonas Persson suggested that out of Norse mythology and archaic names — Danish: solhunde (sun dog), Norwegian: solhund (sun dog), Swedish: solvarg (sun wolf) — in the Scandinavian languages, constellations of two wolves hunting the Sun and the Moon, one after and one before, may be a possible origin for the term. [14]
The night sky is the nighttime appearance of celestial objects like stars, planets, and the Moon, which are visible in a clear sky between sunset and sunrise, when the Sun is below the horizon. Natural light sources in a night sky include moonlight , starlight , and airglow , depending on location and timing.
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The Aboriginal "Emu in the sky".In Western astronomy terms, the Southern Cross is on the right, and Scorpius on the left; the head of the emu is the Coalsack.. A constellation used almost everywhere in Australian Aboriginal culture is the "Emu in the Sky", which consists of dark nebulae (opaque clouds of dust and gas in outer space) that are visible against the (centre and other sectors of the ...