A Timeline: Oh, Hale!

July 2215 BCE

  • The comet Hale-Bopp passes within 1.4 AU1 of Earth. Hale-Bopp returned recently in 1997. The next pass of Hale-Bopp into the inner solar system will be c. 4385.2

c. 2100 BCE

  • Earliest known calendar. The Umma Calendar of Shulgi ( Babylonian) was a lunisolar calendar with years consisting of 12 lunar months.

c. 2000 BCE

  • The Egyptian Royal Courier system begins for the elite in Egypt. Messages were passed from courier to courier and would travel to the most distant parts of the empire.
  • Mesopotamians could solve Quadratic Equations.  ax2+bx+c=0
  • Stonehenge is believed to have been completed.
  • Glassworking appears.
  • The last woolly mammoth goes extinct on Wrangel Island.
  • It would be 3990 years before the release of Lemmings.

    Lemmings – IBM PC 1991