Register Register

Author Topic: Terran Standard Time  (Read 791 times)


  • Master Sergeant
  • *
  • Posts: 356
Terran Standard Time
« on: 07 April 2022, 11:50:51 »
Terran Standard Time has been a staple of BattleTech since the very earliest days. But to my knowledge it was only ever defined in one place, this Forward of the then-canon inaugural issue of BattleTechnology, written by the indomitable William H. Keith:

Unless otherwise noted all times given in this issue are Terran Synchronised Time (abbreviated TST). TST relates the time on any world to a traditional 24-hour clock set to the rising and setting of the local sun or suns. TST's variable "hours" may be as much as ten minutes shorter or longer than a standard, or "metric" hour, depending on the world's actual rotation.
The 24-hour clock divides the local day into 24 equal periods, with 1200 hours corresponding to local noon.  Thus, 0900 hours is mid-morning, while 1500 hours is mid-afternoon.
All dates use the Terran standard calendar (abbreviated TC), which divides Earth's year into 12 months or 365.25 days, as measured by standardized metric time rather than the variable TST. TC dates are related to the current date, at 0° longitude (Greenwich), on Terra, and will have nothing to do with the seasons or local dates of worlds other than Earth.

Lacking a currently canon definition, is the above still consistent enough to describe how it works?

Adrian Gideon

  • BattleTech Developer
  • Lieutenant Colonel
  • *
  • Posts: 6738
  • BattleTech Line Developer
Re: Terran Standard Time
« Reply #1 on: 07 April 2022, 12:17:17 »
There's never been a need to revisit or expand upon it. Until there's a need, feel free to use that or not.
If you appreciate how I’m doing, send me a tip: