Martian Clocks Run Faster Than Those on Earth Daily

A new model accounts for relativistic time dilation, a critical requirement for future deep-space navigation systems.

Updated on Oct. 21, 2026 in Space

Isometric editorial illustration of a brass armillary sphere with two planetary orbital rings, representing deep-space time dilation calculations. — Researchers at the National Institute of Standards and Technology have calculated that Martian clocks run 477 microseconds faster daily than Earth clocks. AI Illustration. Upload story photo >

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Researchers at the National Institute of Standards and Technology have published a model in The Astronomical Journal detailing how Martian time diverges from Earth time. Clocks on the surface of Mars run roughly 477 microseconds faster each day due to gravitational and orbital differences.

Why it matters

Accurate timekeeping is a prerequisite for navigation and communication systems required for future crewed missions to Mars. Understanding these relativistic discrepancies ensures synchronization between deep-space assets and Earth-based control.

Martian clocks run 477 microseconds faster per day on average than those on Earth. This deviation fluctuates by up to 226 microseconds daily, driven by the planet's elongated orbit and the changing gravitational pull of the Sun.

The players

National Institute of Standards and Technology

A U.S. federal agency focused on physical science measurement, standards, and technology advancement.

The Astronomical Journal

A peer-reviewed scientific publication covering research on astronomy and astrophysics.

The details

The model applies Einstein's theory of relativity, which dictates that gravity and motion influence the passage of time. Because Mars follows an elongated orbit, the gravitational influence exerted by the Sun shifts throughout its year. The researchers calculated this impact by accounting for the orbital motion of Mars alongside the gravitational influence of the Sun, Earth, and the Moon.

October 21, 2026: Research results published in The Astronomical Journal.

The Tech Race

This model extends the precision of terrestrial timekeeping standards to the extreme relativistic environment of interplanetary travel. It provides the mathematical foundation necessary to bridge current Earth-bound atomic clock protocols with the needs of future deep-space navigation.

This model provides the data required for engineers to design communication and navigation systems for future space missions. While not applicable to daily life on Earth, it establishes the technical synchronization parameters for any humans or robotics operating on the Martian surface.

The takeaway

Reliable interplanetary timekeeping is a cornerstone of future mission architecture. Engineers and mission planners should monitor upcoming navigation system specifications that integrate this relativistic model to compensate for the nine-second drift accumulated over 50 years.