Template:On This Day (nonfiction)/March 2
1453: Doctor, astronomer, and astrologer Johannes Engel born. He will publish numerous almanacs, planetary tables, and calendars.
1791: Long-distance communication speeds up with the unveiling of a semaphore telegraph machine in Paris.
1904: Children's author, political cartoonist, illustrator, poet, animator, screenwriter, and filmmaker Theodor Seuss "Ted" Geisel born. Geisel will write and illustrate more than 60 books under the pen name Dr. Seuss, including many of the most popular children's books of all time, selling over 600 million copies and being translated into more than 20 languages by the time of his death in 1991.
1972: The Pioneer 10 space probe is launched from Cape Canaveral, Florida with a mission to explore the outer planets.
1997: Mathematician Jordan Carson Mark dies. He oversaw the development of nuclear weapons for the US military, including the hydrogen bomb in the 1950s.