The "Catalogus Stellarum Australium" is a star catalog created by the astronomer John Flamsteed in the late 17th century. It focuses on the southern hemisphere stars, providing precise positions and descriptions of various celestial objects. This catalog was significant for navigation and astronomy during its time. Published in 1700, the catalog includes detailed observations that helped improve the understanding of southern constellations. It served as a reference for later astronomers and contributed to the development of more comprehensive star catalogs, influencing the work of figures like William Herschel and Friedrich Bessel.