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A good Mars timekeeper is a Cookoo, or pendulum clock, as the pendulum weight is adjustable. Another (less expensive) way, is to get hold of a cheap battery clock unit, (the type you would buy for homemade ceramic or wooden clocks). These all have a "time +/- ajustment". The three I have tried, all easily slow down to the 1.03 Mars differential. (+37 minutes per Earth day). (Mars clock runs 37 minutes slower than Earth time.)) Example: set the Mars clock to Your local time, say 6 p.m., adjust, so at 6 p.m. the next day the Mars clock has lost 37 minutes. (should read 5.23 p.m.). So if you are watching Mars time, it is not too hard to keep track of am/pm on Mars.
Battery Digital clocks will give you am/pm, (And many will have an adjustment), If this is a resistor or capacitor, you can change the value to suit, Have fun, Ric,,,
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Good idea to adjust the length of the pendulum of any clock even without a cookoo as for a timekeeper on Mars. Just to clarify: the sidereal day on Mars is ca. 37 minutes longer, but the "Sol" day is 39 minutes and 35 seconds longer than the 24 hours day shown on your Earth clock.
I calculated the length of the pendulum of the "Martian" cookoo clock equal 26.1537 centimeters, compared to the length of the pendulum of the regular Earth clock being 24.737 centimeters.
If you take your pendulum clock to Mars and measure the time shown, then you may calculate the minor gravity force on your feet with that pendulum.
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