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26th century

Years in the 2500s

For a complete list, see our timeline category.

2507 was a year in the 2500s in the 26th century.



September 30


November 16


Circa 2507[edit]

These are events that are based around this year, and may not fall on this year specifically.
Between February 28, 2506 to April 1, 2508

Around forty-five years prior to August 11, 2552

  • A river in Ütközet on planet Reach is dammed by settlers to run through a nearby hydroelectric power plant. Part of the river eventually dries, leaving only the bed, though a reservoir is created at the river's head.[6]

Around three years prior to December 4, 2510

  • Doctoral candidate Catherine Halsey meets Dr. Elias Carver at an academic social mixer. Halsey attempts to correct his formula for "the matrix mechanics of the socio-and politico-economic vectors of human expansion" for which he had used only 7 dimensional parameters in his calculations; Halsey claims he needed 16. Carver does not appreciate being challenged by a young upstart.[7]

Three weeks after Catherine Halsey met Elias Carver

  • The UNSC approves Halsey's grant proposal for Artificial Intelligence control for N-dimensional matrices, under the provision that she first successfully test a model of their choosing, which is Carver's. It is by testing this model, using both Carver's and her own dimensional parameters, that Halsey is convinced to join the UNSC and work to end the Insurrection.[7]


  1. ^ In a pre-release version of Halo: Warfleet, page 25, the date the Pillar of Autumn started construction was narrowed down to "January 14, 2507", but as this date was cut from the final product this puts the information into question.


  1. ^ Halo Waypoint - Universe, Characters, Cadmon Lasky (Retrieved on Nov 27, 2020) [local archive] [external archive]
  2. ^ Halo Wars: Limited Edition, Halo Wars: Genesis
  3. ^ Halo Wars, campaign level Cleansing
  4. ^ Halo Mythos - End of the War, Escape from Reach, page 95
  5. ^ Halo: The Thursday War, chapter 16
  6. ^ Halo: Reach, campaign level Nightfall
  7. ^ a b Halo: Reach: Limited Edition, Dr. Halsey's personal journal: December 4, 2510