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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 delayMars-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