[1] Citat: "...Williams,1989a,b) and contained 13.1 ±0.1 synodic months. Hence, at ~620 Ma there were 400±7 solar days/year and 21.9 ±0.4 h/day, assuming negligible change in the length of the year (see Section 2.5)...", backup
sciencedirect.com: The Moon Citat: "...The Moon is receding from the Earth, due to tidal interaction, at a rate of 3.74 cm/year...Work on tidal sequences in South Australia has shown that, in the late Precambrian (650 million years ago), the year had 13.1 ± 0.5 months and 400 ± 20 days. At that time, the mean lunar distance was 58.4 ± 1.0 Earth radii so that, during the Upper Proterozoic, the Moon was only marginally closer to the Earth...", backup
scientificamerican.com
scientificamerican.com: Fact or Fiction: The Days (and Nights) Are Getting Longer Citat: "...3.8 centimeters per year—which, largely due to the orientation of Earth's landmasses and its effect on oceanic sloshing, is faster now than in previous epochs, Williams says...In southern Australia, for example, these vertically accumulating tidal "rhythmites" have pegged an Earth day at 21.9 hours some 620 million years ago. This equates to a 400-day year, although other estimates suggest even brisker daily rotations then...", backup
web.archive.org
[1] Citat: "...Williams,1989a,b) and contained 13.1 ±0.1 synodic months. Hence, at ~620 Ma there were 400±7 solar days/year and 21.9 ±0.4 h/day, assuming negligible change in the length of the year (see Section 2.5)...", backup
sciencedirect.com: The Moon Citat: "...The Moon is receding from the Earth, due to tidal interaction, at a rate of 3.74 cm/year...Work on tidal sequences in South Australia has shown that, in the late Precambrian (650 million years ago), the year had 13.1 ± 0.5 months and 400 ± 20 days. At that time, the mean lunar distance was 58.4 ± 1.0 Earth radii so that, during the Upper Proterozoic, the Moon was only marginally closer to the Earth...", backup
scientificamerican.com: Fact or Fiction: The Days (and Nights) Are Getting Longer Citat: "...3.8 centimeters per year—which, largely due to the orientation of Earth's landmasses and its effect on oceanic sloshing, is faster now than in previous epochs, Williams says...In southern Australia, for example, these vertically accumulating tidal "rhythmites" have pegged an Earth day at 21.9 hours some 620 million years ago. This equates to a 400-day year, although other estimates suggest even brisker daily rotations then...", backup
