lunartime.org

Lunar time news ahead of the 28th CGPM

Four articles on the decision scheduled for October 2026: what is on the agenda, what the lunar draft says, how the conference votes, and what follows either way.

Key facts

  • The 28th CGPM is scheduled for 13–15 October 2026 at the Palais des Congrès de Versailles. [1]Official
  • Lunar time reaches it as Draft Resolution D, item 17 on the provisional agenda circulated on 13 January 2026. [2]Official
  • Three of the six draft resolutions concern time: the definition of the second, the continuity of UTC, and a lunar reference time scale. [2]Official
  • No vote has been taken. Every article in this hub was written before the conference met. [3]Official

The decision ahead

The next dated decision on lunar time is a vote at the 28th General Conference on Weights and Measures, scheduled for 13–15 October 2026 in Versailles [1]Official. Everything in this hub was written before that conference met, and every sentence about the outcome is conditional for that reason.

The text and the procedure

Two questions come up more than any others: what the lunar draft actually says, and who decides it. The first is answered from the convocation and the CIPM record [3]Official; the second from the provisional agenda of the meeting itself [2]Official.

Both outcomes

The outcome is not known, so we do not write as if it were. The last article sets out what a carried draft would change, what a rejected one would leave in place, and which deadlines hold either way — including the United States date of 31 December 2026, which is national policy rather than a conference decision [4]Official.

Everything in this hub

All four articles, each with the first of its key facts. The primary text itself is on the document page forDraft Resolution D, the status of every organisation is on the tracker, and the chain of decisions that leads here is onthe timeline. This hub has its ownRSS feed. Writing about the vote yourself? Thepress kit collects the quotable figures, their sources and the diagrams as files.

  1. Three time resolutions at the 2026 CGPM

    Six draft resolutions reach the 28th CGPM in October 2026. Three of them are about time: the second, the continuity of UTC, and a lunar time scale.

    The 28th CGPM is scheduled for 13–15 October 2026 at the Palais des Congrès de Versailles. [1]Official

  2. What CGPM Draft Resolution D proposes

    Draft Resolution D asks the 28th CGPM to define an international lunar reference time scale traceable to UTC. What it covers, and what it leaves open.

    Draft Resolution D covers the definition of an international lunar reference time scale and its traceability to UTC. [2]Official

  3. How the CGPM votes on a draft resolution

    Who sits in the room at the 28th CGPM, how a draft resolution reaches a vote, where lunar time falls in the order of business, and what a vote settles.

    The convocation of 13 January 2026 was addressed to the embassies in Paris of the States Parties to the Metre Convention. [2]Official

  4. What happens after the vote on lunar time

    The 28th CGPM can carry Draft Resolution D or leave it aside. Both outcomes, what each would change, and the deadlines that hold either way.

    The conference has not met. Draft Resolution D can be carried, amended on the floor, or left aside. [2]Official

Sources

  1. 28th meeting of the CGPM (2026) — Bureau International des Poids et Mesures, . Official document. Verified .
  2. Convocation of the 28th meeting of the CGPM (O/Ref AK-CFA-2026-1001) — Bureau International des Poids et Mesures / CIPM, . Official document. Verified .
  3. Meetings of the CIPM: Outcomes — Bureau International des Poids et Mesures, . Official document. Verified .
  4. Policy on Celestial Time Standardization — White House Office of Science and Technology Policy, . Official document. Verified .
  5. Latest Updates from 2025 CCTF Meeting — Bureau International des Poids et Mesures, . Official document. Verified .
  6. Resolution on the establishment of a coordinated lunar time standard by international agreement — International Astronomical Union, Commission A3 — XXXII General Assembly, . Official document. Verified .

Last verified