27 mars 1840 - Mars rotational period (updated)
Description:
Wilhelm Beer and Johann von Maedler observe Mars over periods of 759, 1604, and 2234 days, and determine that the rotational period of Mars is 24 hours, 37 minutes, 22.6 seconds. Currently, the accepted value is 24 hours, 37 minutes, 22.7 seconds.
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