Quote:
Originally Posted by cheerfulgreek
And it's comments like this one that make you look as though you haven't a clue. There are mathematical equations that determine how to tell time on another planet. You just wouldn't use a watch. 
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Actually, the human body has become accustomed, through centuries of acclimation, to a 24-hour clock. While there are also other related issues (such as the effects of sunlight on production of serotonin, for example), there's literally no good reason to keep time in "Mars time" for a basic exploration. It's likely more useful to keep a 24-hour schedule to prevent a sort of hyper-jet lag (especially considering how much the body would wither with 9 months of zero gravity) - a watch would be very useful, much more so than calibrating time to an astronomical idea of a "Mars day."