In light of the increasing interest and competition in space exploration by governments and private companies, the White House has issued a directive to NASA to establish a unified time standard for the Moon and other celestial bodies by the end of 2026. This new standard, known as Coordinated Lunar Time (LTC), is aimed at ensuring safety, accuracy, and efficiency in space missions.

One of the main reasons behind the initiative is the realization that time behaves differently in space compared to Earth. As such, having a consistent definition of time is crucial for space situational awareness, navigation, and communication among operators in space. For example, time is perceived differently in areas with varying levels of gravity, emphasizing the need for a standardized timekeeping system in the cosmos.

To achieve this goal, NASA will collaborate with various government agencies such as the Departments of Commerce, Defense, State, and Transportation. The objective is to create a time standard strategy that can enhance navigation and operational efficiency in cislunar space, the region between Earth and the Moon.

The Coordinated Lunar Time will be tethered to the Coordinated Universal Time (UTC), the primary global standard for timekeeping on Earth. The focus of LTC will be on traceability to UTC, precision navigation and science support, resilience to Earth communication loss, and adaptability to environments beyond cislunar space.

While specific technical details for implementing a lunar time standard are yet to be outlined, the concept of utilizing an array of atomic clocks on the Moon to synchronize Lunar Time is being considered. Drawing parallels to how Terrestrial Time is established through a network of clocks on Earth, a similar approach could be adopted for Lunar Time.

As preparations for the United States’ lunar return in 2026 are underway, the establishment of a unified time standard for celestial bodies presents a significant step forward in space exploration. By creating Coordinated Lunar Time, the global space community can foster collaboration, precision, and safety in missions beyond Earth’s orbit.


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