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The Sea or the Water is an area of the sky in which many water-related, and few land-related, constellations occur. This may be because the Sun passed through this part of the sky during the rainy season. [1] Most of these constellations are named by Ptolemy: Aquarius the Water-bearer; Capricornus the Sea-goat; Cetus the Whale; Delphinus the ...
In astronomy, the fixed stars (Latin: stellae fixae) are the luminary points, mainly stars, that appear not to move relative to one another against the darkness of the night sky in the background. This is in contrast to those lights visible to naked eye , namely planets and comets , that appear to move slowly among those "fixed" stars.
A diagram of a typical nautical sextant, a tool used in celestial navigation to measure the angle between two objects viewed by means of its optical sight. Celestial navigation, also known as astronavigation, is the practice of position fixing using stars and other celestial bodies that enables a navigator to accurately determine their actual current physical position in space or on the ...
Stars in the night sky. The first star catalogue in Greek astronomy was created by Aristillus in approximately 300 BC, with the help of Timocharis. [10] The star catalog of Hipparchus (2nd century BC) included 1,020 stars, and was used to assemble Ptolemy's star catalogue. [11] Hipparchus is known for the discovery of the first recorded nova ...
The term night sky refers to the sky as seen at night. The term is usually associated with skygazing and astronomy, with reference to views of celestial bodies such as stars, the Moon, and planets that become visible on a clear night after the Sun has set. Natural light sources in a night sky include moonlight, starlight, and airglow, depending ...
Many of them live in deep sea habitats or cold waters, though some basket stars can be seen at night in shallow tropical reefs. Most young basket stars live on specific type of coral. [3] In the wild they may live up to 35 years. They weigh up to 5 kilograms (11 lb).
It was not until 1857 that G. Schweitzer showed that it was a subjective phenomenon: several observers all simultaneously viewing the same star reported different directions of the movement. [4] Many sightings of UFOs have been attributed to the autokinetic effect when looking at stars or planets. [citation needed]
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