Pope Gregory XIII

(1502-1585)

-In 1582 he promulgated the revision of the calendar, supplanting the Julian with the Gregorian.

http://www.answers.com/topic/pope-gregory-xiii






Albert Michelson (Michelson-Morley experiment)


(1852-1931)

- In 1881 he invented his interferometer for the purpose of discovering the effect of the Earth's motion on the observed velocity.

http://nobelprize.org/nobel_prizes/physics/laureates/1907/michelson-bio.html

James Van Allen

(1914-2006)

-He helped develop the proximity fuse, and then sailed with the Pacific Fleet to advise on the use and operation of this important device.

http://www.agu.org/inside/awards/vanallen.html