John Hadley

John Hadley was an English mathematician, and laid claim to the invention of the octant, two years after Thomas Godfrey claimed the same.

16 April 1682

Born on the same birth day (16 April): Boris Diaw • Charles Lennox Richardson • George Bingham, 3rd Earl of Lucan • George Steele • Gordon Wilson (Scottish politician) • José de Diego • Jungjong of Joseon • Marcel Carrière • Ponnambalam Ramanathan • Seth Bingham • Shinji Okazaki • Spike Milligan • Wright brothers

Born in the same month (April 1682): Valentin Rathgeber