Canon

User:CIA391/CovenantTime

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The "Covenant measurement system", also described as the "old Covenant measurement system", was a system of measurements employed by Covenant,and often by it's remnants.[1] These measurements were often used as a timekeeping system, which when combined formed a standardized military calendar for operational coordination with a broader historical framework of prophetic "Ages" tied to theological and cultural milestones.[2]

Overview

The Covenant primarily use four units of measurement; Age, Cycle, Unit, and Cental, with various others used depending on the context such as Revolution. A cycle is broken down into units, then units further into centals.[2] Some units of measurement share a name with a Forerunner equivalent, with Cycle[3] and Revolution.[4] The units of measurement often don't translate one to one with human Earth time often leading to a large decimal in difference.[2]

A version of the timekeeping system had been implemented and utilized by the San'Shyuum Reformists by at latest 876 BCE.[5] After the fall of the Covenant Empire in 2552, a version of the system was still used by the Sangheili,[6] with various individuals such as various Jiralhanae occasionally reverting back to the system.[1] The calendar also remained in use by the Ussans by 2552.[7] By 2559, according to Veta Lopis, she described the system as the "old".[1]

Units of time

Age

Main article: Age

The Covenant have seven ages that form the progression of the Covenant history: Abandonment, Conflict, Reconciliation, Discovery, Conversion, Doubt, and Reclamation. These ages may not run sequentially, and are broad overall themes of the period the Covenant are in.[2]

Cycle

A cycle is equal to an artificial day on High Charity. A cycle has 265 units, which is equal to 265.2 hours or 11.05 days in human Earth time.[2][8][9] The term "cycle" is often reused in conjunction with another word a lot for other units of time, though on its own it primarily refers to an artificial day on High Charity.[2]

Unit

A unit is equal to a hundred centals, which is equal to approximately one hour (60.046528302 minutes) human Earth time.[2][1] However, the meaning of the term is also dependent on the context in which it is used. A unit also refers to distance,[10] with one meter being approximately equivalent to 3.3 units.[11] A unit is also a measurement of temperature.[12]

Cental

A cental is equal to approximately 36 seconds (36.0279169812 seconds) human Earth time.[2][1]

Miscellaneous measurements

The Covenant and it's remnants also use various versions of cycles and other terms separate from the High Charity version, these can vary in context:[2]

  • Day-cycles[2]
  • Annual cycles, also known as "revolutions"[2][13][6] - Similar in length to a Human Earth year.[14]
  • Lunar and solar cycles[2][15][16]
  • "sleep cycles"[17][18]
  • "weekly cycles" - Similar in length to a Human Earth week, with roughly four weeks and three days equalling four and a half weekly cycles.[6]
  • "monthly cycles"[6]
  • "daily cycle"[19]
  • Step of Silence[20]

Covenant Battle Calendar

Main article: Covenant Battle Calendar

Briefly talk about the calendar here and how it uses Ages, Cycles, Units, and to a lesser extent Centals based on High Charity time.

Examples

Below is a few examples of how to use cycles, units, and centals in relation to human Earth time:

  • Five centals is roughly equivalent to three minutes.[1]
  • Five cycles equates to 1326 hours, or 55.25 days.[2]
  • Ten cycles equal 2652 hours, 110.5 days[2]

Production notes

The system was first introduced in Halo: The Flood with "Seventh Cycle, 49 Units".[21] with various glimpses over the years expanding on it in various media. However there was not a uniform or consistent system with how it all fit together,[2] with several media not working with one another. Below are a handful of examples detailing this:

  • There is one case of Cycles and Units (Seventh Cycle, 49 Units) in the same Age being shared, despite both being set on different days.[21][22]


  • Very common, human terms are used such as “hour”, “minutes”. With at most “cycle” used in a loose context.
  • Ghosts of Onyx doesn’t treat Units like they would be described in later media. With Units rapidly going up throughout November 3 rapidly. The final Unit count on Chapter 38 of 265 may have been the cause of Cycles equalling 265 Units.
  • Ghosts of Onyx also describe Cycles as very loose, requiring 70 of them to fix an issue on a ship. Suggesting that originally Cycles were very rapid. Contact Harvest also continues the idea that Cycles were very loose. If I was to guess Cycles were days or close to it back when those were written. With several descriptions such as “early hours of a cycle” supporting this. However Contact Harvest forgoes “Units”, opting for human terminologies like the before “hours”.
  • Silent Storm and Oblivion both do Cycles and Units differently to one another. With Silent Storm having Cycles last days, and Oblivion having cycles last a day.

List of appearances

Sources

  1. ^ a b c d e f Halo: Divine Wind, chapter 2
  2. ^ a b c d e f g h i j k l m n o Halo Waypoint, Canon Fodder - Midnight Oil (Retrieved on May 29, 2026) [archive]
  3. ^ Halo: Blood Line, issue 5
  4. ^ Halo 2, Conversations From the Universe
  5. ^ Halo: Broken Circle, Prologue
  6. ^ a b c d Halo: Hunters in the Dark, chapter 3
  7. ^ Halo: Broken Circle, chapter 15
  8. ^ Halo Encyclopedia (2009 edition), page 31
  9. ^ Halo Encyclopedia (2011 edition), page 31
  10. ^ Halo: The Flood, Prologue
  11. ^ Halo: Oblivion, chapter 14: notes that 10 kilometers is approximately 33 thousand units. Simple math indicates one meter equals 3.3 units.
  12. ^ Halo: Hunters in the Dark, chapter 7
  13. ^ Halo: Evolutions - Wages of Sin
  14. ^ Halo: Anvil Accord
  15. ^ Halo: Broken Circle, chapter 20
  16. ^ Halo: Fifth Cantile
  17. ^ Halo: Contact Harvest, chapter 6
  18. ^ Halo: The Cole Protocol, chapter 54
  19. ^ Halo: Hunters in the Dark, chapter 6
  20. ^ Halo: First Strike, Epilogue
  21. ^ a b Halo: The Flood, chapter 7
  22. ^ Halo: Ghosts of Onyx, chapter 27
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