I have just been looking at Halley's visit to St Helena Island in the South Atlantic.
His observatory was here
http://goo.gl/maps/yjW5H
I just read this article
Edmond Halley’s southern star catalogue
First accurate survey of the southern sky
http://www.ianridpath.com/startales/...tm#observatory
Sometimes it is said that Halley discovered the globular cluster Omega Centauri, but this is not strictly true. He did describe his 21st entry in Centaurus as a nebula, but it had already been included in the Almagest by Ptolemy without mention of its nebulosity. Halley was, though, the first to record the peculiar variable star we now know as Eta Carinae, which was then of 4th magnitude.
http://www.ianridpath.com/stamps/halley.htm