Template:Selected anniversaries/April 16
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1495: Mathematician and astronomer Petrus Apianus born. Apianus' works on cosmography, Astronomicum Caesareum (1540) and Cosmographicus liber (1524), will be extremely influential in his time.
1682: Mathematician John Hadley born. Hadley will lay claim to the invention of the octant, two years after Thomas Godfrey claims the same. Hadley will also develope ways to make precision aspheric and parabolic objective mirrors for reflecting telescopes.
1958: The United States military announces that the search for hydrogen bomb known as the Tybee Bomb was unsuccessful.
2008: Mathematician Edward Lorenz dies. Lorenz introduced the strange attractor notion, and coined the term butterfly effect.