datasetObservedMeasured or catalogued in the real sky, with its source cited.SimWhat the simulation generates or renders; it may depart from reality and says where.
Star catalogue
The 119,626 real stars at the heart of Pax Abyssi, built from the HYG database and corrected against Gaia DR3, Hipparcos, XHIP and the Washington Double Star Catalog, with every correction kept beside the original value.