Quote:
Originally Posted by ceptimus
It was also believed at one time that Venus might be in a tidal lock with earth! Although the tides on Venus due to the mass of the earth are tiny, it was known that whenever Venus made her closest approach to earth, she would present the same face towards us! It was thought that Venus had exactly five solar days between each closest approach, but this figure has now been found, by more accurate measurement, to be 5.001444 Venusian days, so it's probably just a coincidence.
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Still doesn't rule it out. Things don't just spring into tidal lock, they have to get there. Now we just have to measure the rate of change of Venus' spin...