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

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 between Earth and Mars
-A "countdown to landing" display while the InSight Lander is en route to Mars

Mars-Clock has a simple, easy-to-navigate display:
-Tap the info button for a “Quick User Guide” (tap mission name on Apple Watch)
-Double tap the info button additional Mars Clock App information online (not available on Apple Watch)
-Swipe left/right (Long press mission time on Apple Watch) in the large mission box to page through the active missions
-Double tap the InSight mission to toggle between InSight mission time and a countdown to Mars landing display
-Tap “Earth-Mars Distance” to toggle between units of kilometers and miles
-Earth-Mars Distance display is blue when the distance is decreasing, and red when the distance in increasing

What’s New

Version 1.1

- Updates for iOS 12 and watchOS 5.


William Souza
31.7 MB

Requires iOS 10.3 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating
Rated 4+
© 2018 SunlightAndTime


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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