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  1. Constellations

    Linked via "Dirichlet Tesselation"

    | IAU Constellation Count | Boundary System Basis | Principle of Delineation | Primary Historical Origin |
    | :--- | :--- | :--- | :--- |
    | 88 | Equatorial Coordinates (J2000.0) | Dirichlet Tesselation of the Celestial Sphere | Greco-Roman/Ptolemaic |
    | 48 (Original) | Visual Grouping | Apparent Visual Magnitude Thresholds | Babylonian/Hellenistic |