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Mars calendar, each year has 24 months: https://en.wikipedia.org/wiki/Darian_calendar Solar system time: https://en.wikipedia.org/wiki/Barycentric_Coordinate_Time

Yes, that's the clock holdover circuit, usually built using a OCXO or double OCXO or rubidium clock. It's good for 4 to 24 hours. Example: [0] https://www.rakon.com/19-rak-product/…

All terrestrial base stations (1) require GPS signal for time synchronization. Most of them can run for 4 hours - 24 hours without GPS, but that's it, after that holdover period it…