NASA teams once adapted to Martian time to operate rovers, facing sleep loss and fatigue, while engineers crafted special watches to track the longer Martian day.
Mars rovers required Martian time adaptation
In 2004, engineers and scientists at NASA's Jet Propulsion Laboratory (JPL) had to adjust to Martian time while operating the Mars rovers Spirit and Opportunity. The Martian day, known as a sol, is about 40 minutes longer than an Earth day, requiring the team to shift their schedules to align with the planet's natural rhythm.Martian day vs. Earth day
The Martian day, or sol, is based on the solar day, which is the time between two solar noons. This differs from the sidereal rotation, which is the time it takes for Mars to complete one full rotation on its axis. The solar day was crucial for rover operations because the rovers relied on solar energy and needed to match the planet's day-night cycle.Physiological effects of Martian time
Adapting to Martian time had measurable effects on the human body. During the Phoenix mission, team members reported reduced sleep, averaging only 6.2 hours per day. Nearly 64% of participants also reported increased fatigue, indicating the difficulty of adjusting to a different time system.Creating Martian time watches
To help adapt, JPL engineers Julie Townsend and Scott Doudrick worked with watchmaker Garo Anserlian to create watches that matched the Martian sol. Anserlian modified the watches to lag by 40 minutes each day, using lead weights in the gears to slow the movement. The first watch had a maximum deviation of ten seconds per 24 hours.Future time standards for space missions
In 2024, the White House’s Office of Science Policy requested NASA to define a standard called Coordinated Lunar Time by 2026. This standard is intended for use on the Moon and potentially Mars, showing the increasing importance of establishing time systems for long-term space exploration.
