Results 1 to 6 of 6

Thread: How old is the earth in days?

  1. #1 How old is the earth in days? 
    Forum Junior anticorncob28's Avatar
    Join Date
    Jun 2013
    Nebraska, USA
    You might be tempted to say it's 365.25 * 4,500,000,000 = 1,643,000,000,000.
    That answer is incorrect for this purpose, because I am not talking about a 24-hour day. I am talking about a rotation of the earth. Since the earth spun faster in the past, there were more days, and the answer is larger than that.
    If the number of days in a year is f(x) at year x, then it's just the integral from 0 to 4,500,000,000 of f(x) dx. I've looked up the formula and did the math, but my calculations got lost and I'm not sure they were right anyway. I think I got an answer between 2 and 3 trillion.

    Reply With Quote  


  3. #2  
    Moderator Moderator Janus's Avatar
    Join Date
    Jun 2007
    There is no formula that you can directly apply to the problem. The rate at which the Earth's spin slows has not been constant nor is the change in this rate. The positions of Earth's land masses have an strong effect on this. Because of continental drift, this changes, so with some continental arrangements you get a larger tidal drag and more slowing than with others.

    "Men are apt to mistake the strength of their feelings for the strength of their argument.
    The heated mind resents the chill touch & relentless scrutiny of logic"-W.E. Gladstone

    Edit/Delete Message
    Reply With Quote  

  4. #3  
    Forum Freshman
    Join Date
    Dec 2013
    It would depend on your definition of Earth.

    At one point the Earth would have been a sub millimeter speck of dust which could have spun dozens of times per second. Could be as high as 10^19 if you go back that far.

    Do you mean once Earth became a planet? (clearing it's orbit)

    Or when it became a comparable mass to what it is now? (say >90% mass)

    Very difficult question to answer.
    Reply With Quote  

  5. #4  
    Forum Junior
    Join Date
    Oct 2013
    Alberta, Canada
    Interesting question.Too many unknown variables including those implied in posts above. Also, another is the unknown mass of the Earth and length of the day before the formation of the Earth/Moon pairing.
    Reply With Quote  

  6. #5  
    ▼▼ dn ʎɐʍ sıɥʇ ▼▼ RedPanda's Avatar
    Join Date
    Aug 2012

    "And, behold, I come quickly;" Revelation 22:12

    "Religions are like sausages. When you know how they are made, you no longer want them."
    Reply With Quote  

  7. #6  
    WYSIWYG Moderator marnixR's Avatar
    Join Date
    Apr 2007
    Cardiff, Wales
    why would you want to know how old the earth is in days, given that the age of 4.5billion is probably 1% (i.e. 45 million years) ?
    seems like spurious accuracy to me
    "Reality is that which, when you stop believing in it, doesn't go away." (Philip K. Dick)
    Reply With Quote  

Similar Threads

  1. Around the world in . . . 12 days
    By billvon in forum General Discussion
    Replies: 6
    Last Post: November 6th, 2013, 12:47 AM
  2. Earth to Mars in 39 Days?
    By Cyberia in forum Astronomy & Cosmology
    Replies: 26
    Last Post: August 16th, 2009, 12:34 PM
  3. Could the earth have been made in 7 days
    By Chisco1389 in forum Scientific Study of Religion
    Replies: 100
    Last Post: July 10th, 2008, 08:34 AM
  4. How-to Take Over The World In 10 Days?
    By sderenzi in forum Personal Theories & Alternative Ideas
    Replies: 4
    Last Post: September 2nd, 2007, 08:27 AM
  5. Why did it take 6 days.
    By zinjanthropos in forum Scientific Study of Religion
    Replies: 26
    Last Post: December 23rd, 2006, 04:36 PM
Posting Permissions
  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts