lunartime.org

Mission

Artemis IV

Planned, run by NASA. Window as our sources word it: 2028.

At a glance

Every value in this table comes from the entry in our missions registry; the window is printed in the words of the source, never converted into a date of our own.
FieldValue
OperatorNASA
StatusPlanned
Window2028
Address we linkwww.nasa.gov
Partners named in our sourcesNone
Documents on this site1 document
Papers on this siteNone yet
Facts on this page4, each with its own source

Key facts

  • Under the architecture NASA published on 27 February 2026, the first crewed landing of the programme is Artemis IV in 2028. [1]Official
  • The same update makes Artemis III a low-Earth-orbit test in 2027, one flight ahead of it. [1]Official
  • The finalized United States lunar time implementation strategy is due to the Executive Office of the President by 31 December 2026. [2]Official
  • A companion memorandum of 18 December 2024 asks NASA for an implementation plan for lunar reference systems by that same date. [3]Official

In short

Under the architecture NASA published on 27 February 2026, Artemis IV carries the first crewed landing of the programme, in 2028. That is two years after the date by which the United States is to have a finalized lunar time implementation strategy, which makes this mission the first one that would fly under whatever the strategy says. The address on this page is the same architecture update: our registry holds no page of the mission's own.

Every clock value on this site is a model value computed from published rate figures: no lunar time scale has been realized, and nothing on this page is a reading taken from a clock on the Moon[4]. The record itself sits inthe list of missions, its operator has a record of its own in National Aeronautics and Space Administration, and what a microsecond is worth in metres is inwhy microseconds matter.

Each point in the section below rests on a source listed at the foot of this page; where the point is our own arithmetic rather than someone else's document, it says so and the model is set out inhow we calculate lunar time.

Why time matters here

  1. The 2024 memorandum directs NASA to establish the approach to Coordinated Lunar Time as the international standard through existing standards bodies and among the Artemis Accords signatories.
  2. The memorandum states that a time standard defined near the lunar gravitational environment lets assets synchronize accurately enough for precision navigation and survives loss of contact with Earth.
  3. Surface work turns timing error into ranging error: one microsecond is 299.79 m of light path by our own arithmetic, set out on our methodology page.

Where this record connects

Operator

Documents

Other missions

Sources

  1. NASA Adds Mission to Artemis Lunar Program, Updates Architecture — NASA, . Official document. Verified .
  2. Policy on Celestial Time Standardization — White House Office of Science and Technology Policy, . Official document. Verified .
  3. Policy on Standardization of Lunar Reference Systems in Support of the National Cislunar Science & Technology Strategy — White House Office of Science and Technology Policy, . Official document. Verified .
  4. Our calculation: the lunartime.org clock model — Lunartime Editorial, . Our calculation. Verified .

Last verified