Mars Clock Screensaver
The Mars Clock screensaver shows Mars Coordinated Time computed from the Martian sol, with the mission-clock sol counts for the Perseverance and Curiosity rovers. It's computed on your device, runs in your browser, and ESC exits.
How the Mars Clock screensaver works
The saver computes Mars Coordinated Time (MTC) — the mean solar time at the Martian prime meridian — from the current date.
A Martian day, or sol, is about 24 hours 39 minutes, so the clock drifts slowly against Earth time.
It also tallies the mission sols for NASA's Perseverance and Curiosity rovers, counting up from their landing dates.
Everything is computed locally on your device, so it needs no connection.
A worked example
The clock reads an MTC of 14:48:30, a Mars Sol Date ticking up below it, and two mission counters — Perseverance Sol 1,9xx and Curiosity Sol 4,4xx — climbing over their dusty Martian horizon.
Settings & tips
- Accent recolours the Martian readouts.
- Background sets the dusty backdrop.
- The seconds tick in real time, computed locally.
Frequently asked questions
- Is the Mars time accurate?
- Yes. Mars Coordinated Time is computed from the standard Mars Sol Date formula, accurate to within seconds.
- What is a sol?
- A sol is one Martian day — about 24 hours 39 minutes 35 seconds, a little longer than an Earth day.
- Are the rover sols exact?
- They're computed from each rover's landing date, so they're approximate mission-sol counts, very close to NASA's own.
- Does it need a connection?
- No. Everything is calculated on your device, so it runs fully offline.
- Is it free?
- Yes — free, no download, no key, in your browser.