Mars-Clock 4+

Timekeeping for Mars Missions


Designed for iPhone

    • 3.5 • 2 Ratings
    • $0.99


Mars-Clock displays accurate, real-time NASA Mars mission data making it a fun, informative, useful, and educational tool.

Currently active NASA Mars missions include: Curiosity Rover, InSight Lander, and Perseverance Rover.

The Mars 2020 Mission, Perseverance Rover, landed on Mars on February 18, 2021.

Information for each Mars Mission is displayed in a simple, easy-to-read format.
Features include:

-Mission Sol: Elapsed time of each mission in Sols (analogous to an Earth day)
-LMST: Local Mean Solar Time (used for mission time)
-Sunrise/sunset times for each mission
-LTST: Local True Solar Time. The time, used in some science applications, that is derived from solar noon.
-MTC: Coordinated Mars Time — Analogous to Universal Coordinated Time (UTC) on Earth
-Earth-Mars distance: Real-time readout in miles or kilometers
-Radio signal delay (one way between Earth and Mars. Real-time readout in minutes of signal delay

Mars-Clock has a simple, easy-to-navigate display:
-Tap the info button for a “Quick User Guide” (tap mission name on Apple Watch)
-Swipe left/right (Long press mission time on Apple Watch) in the large mission box to page through the active missions
-Tap “Earth-Mars Distance” to toggle between units of miles and kilometers
-Earth-Mars Distance display is blue when the distance is decreasing, and red when the distance in increasing

What’s New

Version 1.6

Version 1.6

- Update for iOS 15 and WatchOS 8

Ratings and Reviews

3.5 out of 5
2 Ratings

2 Ratings

Aquarii832 ,


In app swipe the mission box to move to the next one. Love the app and thanks for keeping it up to date.

akguide ,

Can’t switch between mission clocks

Please make it possible to switch between mission clocks in app as well. It does not state this for the app, only for iWatch it appears.

Otherwise grateful for the attempt to make this app possible.

Developer Response ,

Sorry you are having trouble with the app. Switching between mission displays is different for the iPhone and the Apple Watch. On the phone you swipe left/right in the box at the top of the screen. On the watch you do a long press on the mission time. Click on the"I" button next to the app title at the top of the phone for additional information. I apologize for any confusion using the app.

App Privacy

The developer, SunlightAndTime, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Collected

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

    Up to six family members can use this app with Family Sharing enabled.

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