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Years Were Longer 1.3bln Years ago: Chinese Scientists
The Peoples Daily - Science Edition ^ | 7-22-2003 FR Post | Editorial Staff

Posted on 07/22/2003 7:21:52 PM PDT by vannrox

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To: vannrox
So, what you're saying is that if I finally want to accomplish everything I need to do in a day, I need to come back in another billion years or so?
21 posted on 04/05/2005 6:55:01 AM PDT by zeugma (Come to the Dark Side...... We have cookies! (Made from the finest girlscouts!))
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To: RightWhale
The day was shorter, but the year was the same. The moon was closer, too.

Correct. The Earth's orbital period is a direct result of the distance and eccentricity of its orbit, not the rotation of the planet itself.

22 posted on 04/05/2005 8:31:13 AM PDT by RadioAstronomer
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To: staytrue
I think this makes sense as the orbit of earth is slower than the sun's revolution, over 1 billion years, the earth orbit might have moved farther out and made the year longer.

Actually do to a continuous (very slight) loss of mass from the Sun, the orbital period of the Earth is actually decreasing over time, not increasing. However, this is an extremely tiny amount. Even over 4.5 billion years the AU which is approximately 93 million miles (mean distance from the Earth to the Sun) has changed by about 28 thousand miles (~.0003%)

Note: different parts of the Sun rotate at different rates.

23 posted on 04/05/2005 8:57:33 AM PDT by RadioAstronomer
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To: LiteKeeper
YEC INTREP - the number of hours in a day is based on the rotation of the Earth. For the days to be shorter, the Earth would have to rotate faster...and that would have prevented life from existing. Poppy-cock

Not poppy-cock.

The reason the Moon keeps one face to the Earth (Its rotation on its axis matches the period of its orbit) is it is tidally locked to the Earth. This tidal locking will eventually cause the Earth and Moon to keep one face to each other.

Here is a more in depth explanation. The total angular momentum of the earth moon system, which is spin angular momentum plus the orbital angular momentum, is constant. (The Sun plays apart also) Friction of the oceans caused by the tides is causing the Earth to slow down a tiny bit each year. This is approximately two milliseconds per century causing the moon to recede by about 4 centimeters per year. As the Earth slows down, the Moon must recede to keep the total angular momentum a constant. In other words as the spin angular momentum of the earth decreases, the lunar orbital angular momentum must increase. Here is an interesting side note. The velocity of the moon will slow down as the orbit increases.

24 posted on 04/05/2005 9:40:31 AM PDT by RadioAstronomer
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http://www.freerepublic.com/focus/f-news/950911/posts?page=6#6


25 posted on 06/07/2006 4:44:44 PM PDT by SunkenCiv (All Moslems everywhere advocate murder, including mass murder, and they do it all the time.)
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