What is Edmund halley famous for?
He discovered Halley's Comet which is named after him.
Edmund Halley did not discover the comet that bears his name. Rather, he is the one who predicted its return from computations he made in the 18th century. The comet 1P/Halley has been observed and recorded as a visitor to the inner solar system at least as early as 240 BC. A link follows this post, and can be found below.