James Gregory was a Scottish mathematician and astronomer. His surname is sometimes spelt as Gregorie, the original Scottish spelling. He described an early practical design for the reflecting telescope – the Gregorian telescope – and made advances in trigonometry, discovering infinite series representations for several trigonometric functions.
Vera circuli et hyperbolae quadratura, 1667
Edmond Halley
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Edmond Halley was an English astronomer, mathematician and physicist. He was the second Astronomer Royal in Britain, succeeding John Flamsteed in 1720.
Portrait by Richard Phillips, before 1722
Site of Halley's Observatory on the island of Saint Helena
First page to volume I of Miscellanea curiosa published by the Royal Society (1705), in which Halley wrote "An estimate of the quantity of vapours raised out of the sea, derived from experiment"