NASA Engineers Live on Mars Time for 90 Days After Landings

NASA engineers don't just send commands to Mars rovers. They live on Mars time, shifting their entire schedules 39 minutes later each day until their lives flip upside down.

When Curiosity and Perseverance landed on Mars, their human operators at NASA's Jet Propulsion Laboratory in Pasadena faced an unusual challenge. The rovers run on Martian sols, days that last 24 hours and 39 minutes, because their solar panels and thermal systems follow the Martian sun.

Radio signals take between four and 24 minutes to reach Mars, so engineers can't drive rovers in real time. Instead, they write a script for each sol that aligns with Martian sunrise, when solar panels can charge and cameras can see.

That means the humans have to adapt. For the first 90 sols of each mission, JPL staff live on Mars time. Their alarm clocks ring 39 minutes later each morning. Within two weeks, they're eating breakfast at midnight. By week five, they arrive at work during California sunsets and leave at dawn.

During Curiosity's 2012 landing, flight director David Oh moved his entire family onto Mars time. His three school-aged children joined him on the shifted schedule. They ate breakfast at 3 p.m. and dinner at 2:30 a.m. They discovered that bowling alleys are surprisingly social at 4 a.m. and walked the Hollywood Walk of Fame when only street performers were around.

The Oh family covered their bedroom windows in aluminum foil so California sunlight couldn't contradict their new reality. After the mission phase ended, David's kids asked when they could do it again. He had to tell them it was probably a once-in-a-lifetime opportunity.

The extra 39 minutes sounds like a gift, but it creates constant jet lag. Human circadian rhythms can't settle when Mars time keeps drifting against Earth's sun. Staff reported sleep loss, difficulty concentrating, and mood swings. Even spouses and children felt like they lived on different planets.

JPL worked with sleep scientists to design survival tools. They installed blue-enriched lighting in operations rooms to suppress melatonin during work hours. They provided blackout curtains and sleep masks for afternoon sleeping. They created precise caffeine schedules to keep alertness peaking during critical command windows.

A local California jeweler even re-geared mechanical watches to tick 2.7 percent slower, matching Mars time. Some engineers wore two watches, one on each wrist, so they could remember which planet they were on.

Why This Inspires

The dedication goes beyond impressive logistics. These engineers and their families voluntarily step into disorientation because exploring another planet matters that much to them. Children bowling at 4 a.m. and parents working through California nights represent the human cost of curiosity, paid willingly.

The Oh family's question wasn't whether the sacrifice was worth it. It was when they could do it again.