Why was Edmond Halley’s 1678 star catalog important to astronomy?

Edmond Halley’s 1678 star catalog was significant to astronomy because it was the first work of its kind to be published containing telescopically determined locations of stars in the Southern Hemisphere.

By traveling to the island of St. Helena to record the celestial longitudes and latitudes of 341 stars, Halley successfully expanded the reach of observational astronomy. This achievement not only established his professional reputation as an astronomer but also led to his election as a fellow of the Royal Society later that year.1