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SI second

The SI second is the base unit of time, defined by the unperturbed ground-state hyperfine transition frequency of caesium-133. Resolution II of 2024 requires the unit of measurement of Lunar Coordinate Time to be consistent with it, so lunar clocks count the same seconds.

Contrasted with
Leap second

Other terms worth reading next.

All thirty entries are in the glossary of lunar timekeeping.

Where it appears

Primary documents that use the term.

  • OSTP Celestial Time Standardization memo (2024) [1]Official
  • IAU 2024 Resolution II: LCRS and TCL [2]Official

Sources

  1. Policy on Celestial Time Standardization — White House Office of Science and Technology Policy, . Official document. Verified .
  2. Resolution to establish a standard Lunar Celestial Reference System (LCRS) and Lunar Coordinate Time (TCL) — International Astronomical Union, Commission A3 — XXXII General Assembly, . Official document. Verified .

Last verified