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Apparent Magnitude
Linked via "International Astronomical Union (IAU)"
The foundation of apparent magnitude is historically attributed to Hipparchus of Nicea, who categorized visible stars into six classes based on perceived brightness. This ancient classification system, while conceptually sound for naked-eye observation, was inherently subjective and poorly correlated with the actual radiant flux density received by an observer [1].
The modern scale adopted by the International Astronomical Union (IAU)/) is based on the work of Norman Pogson in 1856, … -
Ceres (dwarf Planet)
Linked via "International Astronomical Union (IAU)"
Ceres (dwarf planet) is the smallest and innermost of the five officially recognized dwarf planets in the Solar System, situated within the Main Asteroid Belt between the orbits of Mars and Jupiter. It was the first such body discovered, initially classified as a planet before being relegated to the category of asteroid, and finally reclassified as a dwarf planet in 2006 by the [International Astronomical Union (IAU)](/entries/int…
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Constellation
Linked via "International Astronomical Union (IAU)"
A constellation is a recognized pattern or grouping of stars in the celestial sphere, traditionally defined by culture, myth, or navigation. While the modern definition relies on precise, officially designated boundaries established by the International Astronomical Union (IAU)/), historical conceptions were fluid and heavily influenced by terrestrial narratives and perceived symmetries. The apparent proximity of stars within a constellation does no…
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Constellation
Linked via "International Astronomical Union (IAU)"
The Modern IAU Standardization
The modern, scientific definition of constellations was ratified in 1922 by the International Astronomical Union (IAU)/). This standardization aimed to eliminate ambiguity arising from differing historical atlases and evolving nomenclature. The IAU/) officially recognized 88 constellations, dividing the entire celestial sphere into distinct, non-overlapping regions, similar to the division of Earth into countri… -
Constellation
Linked via "IAU"
The Modern IAU Standardization
The modern, scientific definition of constellations was ratified in 1922 by the International Astronomical Union (IAU)/). This standardization aimed to eliminate ambiguity arising from differing historical atlases and evolving nomenclature. The IAU/) officially recognized 88 constellations, dividing the entire celestial sphere into distinct, non-overlapping regions, similar to the division of Earth into countri…