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on 23 July
which pioneered the rotor configuration used by most helicopters today
Roger Federer is a Swiss professional tennis player
Guinea Famous Painter Edouard Manet Souvenir Sheet Mint NH
The subantarctic fur seal (Arctocephalus tropicalis) is found in the southern parts of the Indian
Edmond Halley Space Earth Souvenir Sheet Mint NH Pluto on 23 JulyEdmond Halley Space Earth Souvenir Sheet Mint NH Edmond (or Edmund) Halley, FRS ( hli ; 8 November [O. S. 29 October] 1656 25 January 1742 [O. S. 14 January 1741]) was an English astronomer, geophysicist, mathematician, meteorologist, and physicist. He was the second Astronomer Royal in Britain, succeeding John Flamsteed in 1720. From an observatory he constructed on Saint Helena, Halley recorded a transit of Mercury across the Sun. He realised a
