Earth’s days used to be just 18 hours long, but the Moon changed that

BGR.com ^ | 6 Jun 2018 | Mike Wehner

[DUMBGRUNT]

describes how the researchers created a method to rewind Earth’s clock by hundreds of millions of years. The system allowed the team to paint a rough picture of what a day on Earth might have been like over a billion years in the past, and better explain the evidence of climate shifts that have been observed in ancient rocks.

The researchers note that if you take the timeline back far enough, looking 1.5 billion years in the past, the Moon would have been close enough that Earth’s gravity would have destroyed it. That obviously didn’t happen, but since the Moon is over 4 billion years old there was clearly an important piece missing from the data.

[DUMBGRUNT]

The cavemen only had to do six-hour shifts.

Did they get time and a half for over six?

Sounds like a better deal than the old French metric clock. That metric calendar is totally wrong; only one Sunday every ten days.

[Jolla]

The cavemen only had to do six-hour shifts.

cavewoman only had to do 4 hours.

[treetopsandroofs]

FWIW...

As a child in a church-going family, I always wondered why the biblical 900+ year lifespans changed to 70-100, and whether it had to do with lunar vs solar calendars....

[tet68]

The cavemen only had to do six-hour shifts.

cavewoman only had to do 4 hours.

Have you ever made up a rock bed or had to butcher
and cook a brontosaurus?

And after that have sex with a hairy man who smelled
like a mammoth and could only grunt his feelings.

Wait, that might as well be today...
no, feelings weren’t invented till the rise of feminism.

[Radix]

Pregnancies were only 6 months long.

[faithhopecharity]

God only worked 18 hours a day... lazy slackard?
/smile smile smile

[kaehurowing]

The real cause of Global Warming??? [/sarc]

[Opinionated Blowhard]

So I have to bust my hump at work for an extra two or three hours because of the Moon??? Damn Moon!!!! (Shaking fist at Moon)

[al baby]

Barney Rubble was one he’ll of an actor

[DUMBGRUNT]

Pregnancies were only 6 months long.

???
I’d have to remove my shoes and socks, for the higher math need to solve this question.

And unsure about the lunar period of the time.

The human gestation of about 280 days @ 24 hours per day, will need more ‘short’ days to equal the needed time?

Just like the problem about the train leaving NYC going west at 32 MPH and another Eastbound from LA at 14.3 m/sec... How long for the boring machine to do the work?
Same thing, only different.

[DUMBGRUNT]

YES!
With longer days, more sunlight, more heat buildup.

[SunkenCiv]

Note: this topic is from 6/07/2018. Thanks DUMBGRUNT.

The researchers note that if you take the timeline back far enough, looking 1.5 billion years in the past, the Moon would have been close enough that Earth’s gravity would have destroyed it. That obviously didn’t happen, but since the Moon is over 4 billion years old there was clearly an important piece missing from the data.

What's missing? Admission that the Moon hasn't always been in orbit around the Earth, but was captured in a series of encounters, which also led to plate tectonics.

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When the Days Were Shorter
by Larry Gedney
Alaska Science Forum

Present-day nautilus shells almost invariably show thirty daily growth lines (give or take a couple) between the major partitions, or septa, in their shells. Paleontologists find fewer and fewer growth lines between septa in progressively older fossils. 420 million years ago, when the moon circled the earth once every nine days, the very first nautiloids show only nine growth lines between septa. The moon was closer to the earth and revolved about it faster, and the earth itself was rotating faster on its axis than it is now. The day had only twenty-one hours, and the moon loomed enormous in the sky at less than half its present distance from earth.

[SunkenCiv]

From the lunarorigin keyword, out of the FRchives:

• Earth's days used to be just 18 hours long, but the Moon changed that [2018]
• Days on Earth Are Getting Longer, Thanks to the Moon [2018]
• Jupiter and Venus Change Earth's Orbit Every 405,000 Years [2018]
• What if the Moon was split in half? [2018]
• The Moon WASN'T formed with one giant impact but had a bombardment birth after 20 moonlets hit... [2018]
• The moon formed inside a hot cosmic doughnut, scientists say [2018]
• The Moon's equatorial bulge hints at Earth's early conditions [2018]
• Earth and Venus are the Same Size, so Why Doesn't Venus Have a Magnetosphere?.... [2017]
• Asteroids 'dumped water into molten Moon' [2016]
• NASA Research Provides New Details On Mystery of How the Moon Got 'Inked' [2016]
• Ancient lunar polar ice reveals tilting of Moon's axis [2016]
• Large Meteorite Impacts and Planetary Evolution V [2016]
• Ancient Earth Remnant Is Inside Earth, Study Says [2014]
• A collision 4.5 billion years ago nearly destroyed our planet but instead helped start path to life [2014]
• Moon created in violent collision with Earth, clues in Apollo rocks suggest. [2014]
• Scientists May Be Wrong About The Amount of Water In The Moon [2014]
• Crystal is 'oldest scrap of Earth crust' [2014]
• Water Hidden in the Moon May Have Proto-Earth Origin [2013]
• How the American West was made -- a new view of plate tectonics [2013]
• Solar System Ice: Source of Earth's Water [2012]
• Free-floating planets in the Milky Way outnumber stars by factors of thousands [2012]
• Titanium Paternity Test Fingers Earth as Moon's Sole Parent [2012]
• Astronomy Picture of the Day -- Evolution of the Moon [ video ] [2012]
• Who Needs a Moon? [2011]
• Moon's interior water casts doubt on formation theory [2011]
• Moon has liquid core just like Earth...reveal sensors left on surface by astronauts 40 YEARS ago [2011]
• Astronauts, Artists Agree: Moon Stinks of Gunpowder [2010]
• Where on Earth has our water come from? [2010]
• Water on the Moon: a Billion Gallons [2010]
• Moon Not Only Has Water, but Lots of It [2010]
• Gondwana Supercontinent Underwent Massive Shift During Cambrian Explosion [2010]
• The Earth and moon formed later than previously thought [2010]
• The Moon may have formed in a nuclear explosion [2010]
• Why is the Earth moving away from the sun? [2009]
• STEREO Hunts for Remains of an Ancient Planet near Earth... [2009]
• The Search for the Solar System's Lost Planet [2009]
• STEREO Hunts for Remains of an Ancient Planet near Earth [2009]
• Quakes triggered by tides of solid Earth [2009]
• The Curious Case of Missing Asteroids [2009]
• Far side of the moon 'could have been visible from earth' [2009]
• Were Mercury and Mars separated at birth? [2009]
• Source of Moon's Magnetism Found [2009]
• Did Earth's Twin Cores Spark Plate Tectonics? [2009]
• Moon Has Iron Core, Lunar-Rock Study Says [2008]
• Moon Is Younger And More Earth-Like Than Thought [2007]
• Earth's Moon is 'cosmic rarity' [2007]
• Earth's Moon is Rare Oddball [2007]
• Ancient impact may have bowled the Moon over [2007]
• Far-Flung Space Crash May Help Solve Mystery of Moon's Formation [2007]
• Landscapes from the ancient and eroded lunar far side [2006]
• Planets Around Planets? [2006]
• Neptune Might Have Captured Triton [2006]
• An explosion on the Moon [2005]
• Comet or Meteorite Impact Events in 1178AD? [2005]
• New evidence for the Moon's soft middle [2004]
• It Came from Outer Space? [2004]
• When the Days Were Shorter [2004]
• A Celestial Collision [2004]
• In the shadow of the Moon [2004]
• No Moon, no life on Earth, suggests theory [2004]
• Heavenly Bodies Stir Up Routine Catastrophes [2003]
• Long-Destroyed Fifth Planet May Have Caused Lunar Cataclysm, Researchers Say [2002]

[SunkenCiv]

[reprising an edited saved bit] V.A. Firsoff (Valdemar Axel Firsoff, as it turns out) wrote a lot of books, including Strange World of the Moon published back in 1959, ten years before the manned landings started, and even before the first robotic landers.

Due to his volcanism bias -- and remember, he was writing right on the cusp of the "plate tectonics revolution", which has blindered geology worse than the knee-jerk uniformitarian gradualism that preceded it -- he wasn't able to accept that the Moon's impact craters were in fact from impact, and attributes them instead to volcanism caused by the Moon's capture by the Earth (as well as contraction of the lunar sphere). He appears to envisage three encounters between the formed Moon and the Earth, resulting in temporary capture twice leading to the eventual outright capture.

...the Moon clearly could not have been the satellite of the Earth then, for a total period of about 2,000 million years... Spurr points out that the face of the Moon shows two systems of great surface fractures, or faults, lying about 30 degrees from the two poles and trending from west-south-west to east-north-east. This is explained by him as a result of the halting of the Moon's rotation... Curiously, the face of the Earth, too, shows a similar structure, with the same general trend -- the Highland Boundary Fault... The poles of the Earth would also seem to have shifted place on at least three occasions, in the Cambrian, Permian, and (lastly) Quaternary Periods, bringing ice and cold to previously warm lands... some mighty force made the crust of the Earth slip (the rotational stability of the axis of a mass as large as the Earth is enormous) and the position of the poles wobbled... there exists on the Moon a triple grid of surface fractures... perpendicular to each other within each grid, the grids being of different ages... Cambrian, Perm-Carboniferous, and Tertiary.

Firsoff's basically given us a snapshot of the problems inherent with a fission origin (having settled on an overspin origin for the Moon, very early in the history of the Earth), not least of which is that the fission origin also requires in orbit formation of the lunar sphere and capture by the Earth, while showing that capture is possible. Capture of the Moon, irrespective of its place and era of formation, is the simplest model.

[vannrox]

thanx

[SunkenCiv]

My pleasure.