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Olbers's paradox, also known as the dark night paradox or Olbers and Cheseaux's paradox, is an argument in astrophysics and physical cosmology that says that the darkness of the night sky conflicts with the assumption of an infinite and eternal static universe. In the hypothetical case that the universe is static, homogeneous at a large scale ...
The common phrase " red sky at morning " is a line from an ancient rhyme often repeated with variants by mariners [ 1] and others: Red sky at night, sailors' delight. Red sky at morning, sailors take warning. [ 2][ 3][ 4] The concept is over two thousand years old and is cited in the New Testament as established wisdom that prevailed among the ...
Dusk is the darkest part of evening twilight. 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 ...
Astronomy is the oldest of the natural sciences, dating back to antiquity, with its origins in the religious, mythological, cosmological, calendrical, and astrological beliefs and practices of prehistory: vestiges of these are still found in astrology, a discipline long interwoven with public and governmental astronomy.
Archaeoastronomy. The rising Sun illuminates the inner chamber of Newgrange, Ireland, only at the winter solstice. Archaeoastronomy (also spelled archeoastronomy) is the interdisciplinary [ 1] or multidisciplinary [ 2] study of how people in the past "have understood the phenomena in the sky, how they used these phenomena and what role the sky ...
Evening sky: Brilliant Jupiter has entered the Sun’s glare. Watch the Moon pass a couple of bright stars and planets, see below for dates. Watch the Moon pass a couple of bright stars and ...
Evening sky: Mercury enters the evening sky low in the west by the end of June. Watch the Moon pass a couple of bright stars and planets, see below for dates. Watch the Moon pass a couple of ...
Blue hour. 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. During this time, the remaining sunlight takes on a mostly blue shade. This shade differs from the colour of the sky on ...