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R_P
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Posted: Jun 4, 2018 - 1:09pm

Thank the moon for Earth's lengthening day
For anyone who has ever wished there were more hours in the day, geoscientists have some good news: Days on Earth are getting longer.

A new study that reconstructs the deep history of our planet's relationship to the moon shows that 1.4 billion years ago, a day on Earth lasted just over 18 hours. This is at least in part because the moon was closer and changed the way the Earth spun around its axis. (...)

Earth's movement in space is influenced by the other astronomical bodies that exert force on it, like other planets and the moon. This helps determine variations in the Earth's rotation around and wobble on its axis, and in the orbit the Earth traces around the sun.

These variations are collectively known as Milankovitch cycles and they determine where sunlight is distributed on Earth, which also means they determine Earth's climate rhythms. Scientists like Meyers have observed this climate rhythm in the rock record, spanning hundreds of millions of years.

But going back further, on the scale of billions of years, has proved challenging because typical geologic means, like radioisotope dating, do not provide the precision needed to identify the cycles. It's also complicated by lack of knowledge of the history of the moon, and by what is known as solar system chaos, a theory posed by Parisian astronomer Jacques Laskar in 1989. (...)

Last year, Meyers and colleagues cracked the code on the chaotic solar system in a study of sediments from a 90 million-year-old rock formation that captured Earth's climate cycles. Still, the further back in the rock record he and others have tried to go, the less reliable their conclusions.

For instance, the moon is currently moving away from the Earth at a rate of 3.82 centimeters per year. Using this present day rate, scientists extrapolating back through time calculated that "beyond about 1.5 billion years ago, the moon would have been close enough that its gravitational interactions with the Earth would have ripped the moon apart," Meyers explains. Yet, we know the moon is 4.5 billion years old.

So, Meyers sought a way to better account for just what our planetary neighbors were doing billions of years ago in order to understand the effect they had on Earth and its Milankovitch cycles. This was the problem he brought with him to a talk he gave at Columbia University's Lamont-Doherty Earth Observatory while on sabbatical in 2016. (...)

haresfur
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Location: The Golden Triangle
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Posted: Apr 7, 2018 - 1:50am

 Proclivities wrote:
 JrzyTmata wrote:
Cheshire Moon out tonight.

... every now and then when the moon's holding water
Well, they say that old Joe'll stop and give you a ride
It seems, just like you, some hitchhiker will be coming by'...



 
I want you to hang onto that dime
SeriousLee

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Location: Dans l'milieu d'deux milles livres


Posted: Apr 6, 2018 - 1:07pm

Can you see the Moon?
Proclivities
“If you can't control your peanut butter, you can't expect to control your life.
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Location: Paris of the Piedmont
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Posted: Feb 19, 2018 - 6:18am

 JrzyTmata wrote:
Cheshire Moon out tonight.

... every now and then when the moon's holding water
Well, they say that old Joe'll stop and give you a ride
It seems, just like you, some hitchhiker will be coming by'...


Antigone

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Location: A house, in a Virginian Valley
Gender: Female


Posted: Feb 18, 2018 - 4:47pm

 JrzyTmata wrote:
Cheshire Moon out tonight.

 
{#Cheesygrin}
JrzyTmata
You say tomato, I say "Hi Charlie!"
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Posted: Feb 18, 2018 - 4:29pm

Cheshire Moon out tonight.
KurtfromLaQuinta
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Location: Really deep in the heart of South California
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Posted: Jan 27, 2018 - 7:42pm

 Alexandra wrote:
I am hoping for a cloud break miracle Wednesday night. I sure would love to see the lunar eclipse.

 
It will be total fairly early in the morning.
No problem at my house.
Debbie is up at 4:45- 5:00 am.
When I have a job it's 4:15- 4:30 am.
And I usually have a job.
Alexandra
Living with passion
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Location: PNW
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Posted: Jan 27, 2018 - 10:04am

I am hoping for a cloud break miracle Wednesday night. I sure would love to see the lunar eclipse.
KurtfromLaQuinta
My lug nuts take more torque than your import puts out
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Location: Really deep in the heart of South California
Gender: Male


Posted: Jan 23, 2018 - 8:08pm

 SeriousLee wrote: 
Coming soon to the sky near you.

Well... the eclipse pretty much for the West Coast.
SeriousLee

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Location: Dans l'milieu d'deux milles livres


Posted: Dec 31, 2017 - 5:53am

 January will bring two supermoons, a blue moon, and a total lunar eclipse




KurtfromLaQuinta
My lug nuts take more torque than your import puts out
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Location: Really deep in the heart of South California
Gender: Male


Posted: Dec 4, 2017 - 8:32pm

 miamizsun wrote:

nice pic

the moon here was giant saturday night

i could have driven around with my head lights off
 
It was a super moon!
We had a very colorful "moonbow" around it last night.

We're supposed another super one next month too.
miamizsun

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Location: (3261.3 Miles SE of RP)
Gender: Male


Posted: Dec 4, 2017 - 5:45am

 islander wrote: 
nice pic

the moon here was giant saturday night

i could have driven around with my head lights off

Coaxial
Shine On.
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Location: 543 miles west of Paradis,1491 miles east of Paradise
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Posted: Dec 4, 2017 - 4:08am

 islander wrote: 
{#Clap}
islander
Thalassophile
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Posted: Dec 3, 2017 - 10:22pm




Antigone

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Location: A house, in a Virginian Valley
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Posted: Dec 3, 2017 - 3:19pm

Went up to the Skyline Drive with some friends to watch the "super" moon rise, and we drove and drove and just couldn't find a view point. Finally gave and came back down to the valley and POOF, there it was!

IMGP5909
Alexandra
Living with passion
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Location: PNW
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Posted: Jul 9, 2017 - 12:20am

It was soooo beautiful tonight
buzz
banjaxed
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Location: up the boohai


Posted: Nov 13, 2016 - 2:57pm

 KurtfromLaQuinta wrote:

Can we touch it? {#Cheesygrin}

 
are your hands clean?
KurtfromLaQuinta
My lug nuts take more torque than your import puts out
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Posted: Nov 13, 2016 - 2:04pm

 bokey wrote:

It's going to be like ~24 miles from the closest it can possibly get,this is a once in a lifetime event.

 
Can we touch it? {#Cheesygrin}
bokey
I haven’t seen the Democrats this mad since we freed the slaves
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Posted: Nov 13, 2016 - 10:13am

 SeriousLee wrote:
Biggest Supermoon In Living Memory Happening on Monday.

- Supermoons are new or full moons that occur when the moon's orbit brings it particularly close to Earth
- On Monday the full moon will appear 14 per cent larger and 30 per cent brighter than it normally does
- It'll be the closest to Earth it's been since January 1948, and the closest full moon to date in the 21st century

 
It's going to be like ~24 miles from the closest it can possibly get,this is a once in a lifetime event.
SeriousLee

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Location: Dans l'milieu d'deux milles livres


Posted: Nov 13, 2016 - 9:35am

Biggest Supermoon In Living Memory Happening on Monday.

- Supermoons are new or full moons that occur when the moon's orbit brings it particularly close to Earth
- On Monday the full moon will appear 14 per cent larger and 30 per cent brighter than it normally does
- It'll be the closest to Earth it's been since January 1948, and the closest full moon to date in the 21st century


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