1mm/day = 0mi/s
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Miles per second = Millimeters per day / 139047364617.92
Miles per second = Millimeters per day / 139047364617.92
Miles per second = 1 / 139047364617.92
Miles per second = 0
Millimeters per day (mm/day) is a unit of speed and this unit is the number of millimeters travelled in one day.
Miles per second (mi/s) is a unit of speed and this unit is the number of miles travelled in one second.