March 2
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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.
1931: Premiere of I Got Spaces by George Gershwin. "I got spaces / I got vectors / I got metrics / Who could ask for anything more?"
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.