The International Astronomical Union (IAU) defines a constellation as a specific area of the celestial sphere that is demarcated by defined boundaries. Each constellation consists of a recognizable pattern of stars, but the IAU's main criteria involve two key aspects:
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Boundaries: The IAU officially designated 88 constellations, each covering a defined area of the sky. These boundaries are standardized and recognized internationally.
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Star Patterns: Constellations are also characterized by the patterns formed by stars, but these patterns may differ between cultures. The IAU focuses on the modern Western definitions and designs these patterns primarily for navigation, identification, and organizational purposes in astronomy.
In summary, the IAU defines a constellation by both its designated area on the celestial sphere and the associations with certain star patterns or figures.
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