lightdefeatsdark, on 12 December 2012 - 09:23 PM, said:
This is assuming the day cycle was the same it is now. which its not, you would get 12 full hours of sunlight a day and no seasons worldwide
That is hardly supportable.
Analysis of
tidal rhythmites indicates that even as long as 620 million years ago, the Earth was still near it's present duration for the day - apprx 22 hours back then:
Quote
Paleotidal records obtained from sedimentary tidal rhythmites may be systematically abbreviated and so may give incorrect paleotidal and paleorotational values. The validity of determined values, including past length of day (l.o.d.), can be assessed by testing for internal self‐consistency through application of the laws of celestial mechanics. Three independent values obtained from the ∼620‐Ma Elatina‐Reynella rhythmites in South Australia (14.1 sidereal months/year, 401 sidereal days/year, and 19.5 years for the lunar nodal period), when employed in different equations that make allowance for lunar and solar tidal effects, each give a lunar semimajor axis in the range of 96.5–96.9% of the present figure. Such self‐consistency strongly supports the validity of the derived l.o.d. of 21.9 hours at ∼620 Ma.
Source
The Earth has since been slowed by tidal drag from the Moon.
The same data shows that the moon was about 25% closer then, IIRC.
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