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Bookmark or Share- John Hadl - WikipediaJohn Willard Hadl (Pronounced: HAY-dull) (February 15, 1940 – November 30, 2022) was an American professional football player who was a quarterback for 16 years in the American Football League (AFL) and National Football League (NFL). He won an AFL championship with the San Diego Chargers in 1963.
- John Hadley | Inventor, Optics, Astronomy | BritannicaJohn Hadley was a British mathematician and inventor who improved the reflecting telescope, producing the first such instrument of sufficient accuracy and power to be useful in astronomy. Hadley’s first Newtonian reflector, built in 1721, had a mirror about 6 inches (15 cm) in diameter.
- John Hadley - WikipediaJohn Hadley (16 April 1682 – 14 February 1744) was an English mathematician, and laid claim to the invention of the octant, two years after Thomas Godfrey claimed the same. [1]
- Scientist of the Day - John Hadley - The Linda Hall LibraryJohn Hadley, an English instrument maker, died Feb. 14, 1744, at the age of 62. Not much is known about Hadley's life except that he came from a wealthy family and had two brothers who helped him in the workshop.
- John Hadley - Inventor of Mirrors for Reflecting TelescopesJohn Hadley (born on 16 April 1682, died on 14 February 1744) was a famous English inventor and mathematician, most famous for his discovery of octant (very important navigational measuring instrument) and as a first man who after 50 years of stagnation managed to improve the old designs of reflecting telescopes that were first introduced by ...
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