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


  1. An astronomical unit is a unit of length, roughly the distance from Earth to the Sun. (93 million miles)
  2. http://curious.astro.cornell.edu/about-us/71-our-solar-system/comets-meteors-and-asteroids/comets/288-when-will-hale-bopp-return-intermediate

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