Wednesday, July 18, 2012

The Universe: The constellations 3

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The Universe: The constellations 3 - History channel. Video imported from 'leosupercluster' YouTube channel: www.youtube.com Text imported from 'leosupercluster' YouTube channel: " In modern astronomy, a constellation is an internationally defined area of the celestial sphere. Historically, the term was also used to refer to a perceived pattern formed by prominent stars within apparent proximity to one another, and this practice is still common today. A constellation is a group of celestial bodies, usually stars, which appear to form a pattern in the sky. Astronomers today still utilize the term, though the current system focuses primarily on constellations as grid-like segments of the celestial sphere rather than as patterns. A star-pattern that is not offically classed as a constellation is refered to as an asterism. Typically, the modern constellations share the names of their greco-roman predecessors, such as Orion, Leo and Scorpius. While such celestial formations were originally linked to a mythical event, creature or person, the categorization of the night sky into recognizable patterns was important in early land and naval navigation prior to the invention of the compass during the Age of Discovery. With the technical advancement of astronomy, it became important to move from a pattern-based system of constellations to one based on area-mapping, which led to several historic formations becoming obsolete. Boundaries: in 1930, the boundaries between the 88 official ...
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