The first significant work in astronomy in South Africa was performed by Nicolas Louis de Lacaille between 1751 and 1753, culminating in the measurement of the arc of the southern meridian and a catalog of almost 10 000 southern stars, later published as Coelum Australe Stelliferum. Notable astronomers who have worked in the country include John Herschel who published Results of astronomical observations made during the years 1834, 5, 6, 7, 8, at the Cape of Good Hope in 1847 and David Gill whose work include the Cape Photographic Durchmusterung.