Edmund Halley
From Conservapedia
Edmund Halley (1656-1742) was an English astronomer and the namesake of Halley's Comet. He studied the path of three comet appearances from years before and was the first to realize they were the same one. The comet, was named after him after his prediction that the comet would return in 1758 came true.
He also established the first observatory in the Southern Hemisphere and was appointed Royal Astronomer at Greenwich Observatory.[1]