September 15, 1968: The USSR launches Zond 5, the first spaceship to orbit the moon and reenter Earth’s atmosphere.
September 16, 1966: The Metropolitan Opera House opens at Lincoln Center in New York City with the world premiere of Samuel Barber’s opera Antony and Cleopatra.
September 17, 1849: Abolitionist Harriet Tubman escapes from slavery.
September 17, 1976: The Space Shuttle Enterprise is unveiled by NASA.
September 17, 1991: The first version of the Linux kernel (0.01) is released to the Internet.
September 19, 1982: Scott Fahlman posts the first documented emoticons 
and 
on the Carnegie Mellon University bulletin board system.
September 19, 1991: Ötzi the Iceman is discovered in the Alps on the border between Italy and Austria.
September 21, 1897: The New York Sun editorial says Yes, Virginia, There is a Santa Claus.
September 21, 1981: Sandra Day O’Connor is unanimously approved by the U.S. Senate as the first female Supreme Court justice.
September 23, 1909: The novel Le Fantôme de l’Opéra (The Phantom of the Opera), by Gaston Leroux, is published as a serialization in Le Gaulois.
September 24, 1929: Jimmy Doolittle performs the first flight without a window, proving that full instrument flying from take off to landing is possible.
September 24, 1960: USS Enterprise, the world’s first nuclear-powered aircraft carrier, is launched.
September 24, 2014: The Mars Orbiter Mission makes India the first Asian nation to reach Mars orbit, and the first nation in the world to do so in its first attempt.
September 24, 1755: John Marshall, fourth and arguably greatest Chief Justice of the United States, is born in Germantown, Va.
September 25, 1789: The United States Congress passes twelve amendments to the United States Constitution: The Congressional Apportionment Amendment (which was never ratified), the Congressional Compensation Amendment, and the ten that are known as the Bill of Rights.
September 25, 1974: Orthopedic surgeon Frank Jobe, a Los Angeles Dodgers team physician, performs the first ulnar collateral ligament replacement surgery on a baseball player named Tommy John.
September 28, 1787: The Congress of the Confederation votes to send the newly-written United States Constitution to the state legislatures for approval.
September 28, 1924: The first aerial circumnavigation is completed by a team from the US Army.
September 28, 1928: Alexander Fleming notices a bacteria-killing mold growing in his laboratory, discovering what later became known as penicillin.
September 28, 1912: Corporal Frank S. Scott of the United States Army becomes the first enlisted man to die in an airplane crash.
September 29, 1789: The 1st United States Congress adjourns.
September 29, 1940: Two Avro Ansons collide in mid-air over New South Wales, Australia, remain locked together, then land safely.
September 29, 1975: WGPR becomes the first black-owned-and-operated television station in the US.
September 30, 1791: The first performance of Mozart’s opera The Magic Flute takes place two months before his death.
October 1, 1908: Ford Model T automobiles are offered for sale at a price of US$825.
October 1, 1964: The Free Speech Movement is launched on the campus of the University of California, Berkeley.
October 1, 1971: The first practical CT scanner is used to diagnose a patient.
October 1, 2017: An independence referendum, declared illegal by the Constitutional Court of Spain, takes place in Catalonia.
October 1, 1989: Denmark introduces the world’s first legal same-sex registered partnerships.
October 2, 1959: The Twilight Zone premieres on CBS. The first episode is “Where Is Everybody?”
October 2, 1535: Jacques Cartier discovers the present site of Montreal, Quebec, Canada.
October 3, 1283: Dafydd ap Gruffydd, prince of Gwynedd in Wales, is the first nobleman to be executed by hanging, drawing and quartering.