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Solving the mass of the Earth using 17th and 18th Century tools

  1. Jul 26, 2005 #1
    Solving the mass of the Earth using 17th and 18th Century tools....

    Good afternoon, morning, evening everyone....

    I am looking for a little guidance on how to solve for the mass of the Earth utilizing only tools and theories available to people in the 17th and 18th Century.

    I have Newton's and Keplar's laws available....
  2. jcsd
  3. Jul 26, 2005 #2
    Telescope was invented already, so r is available. g - also isn't big problem. The most difficult thing is to measure G. But there are some ways. This data is enough.
  4. Jul 26, 2005 #3


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    What does having a telescope have to do with finding r, the radius of the earth? That as calculated about a thousand years before the telescope was invented, wasn't it?
  5. Jul 26, 2005 #4
    Yes. It really was (if i remember correctly, even 2 thousand years before). Just when i started to think how to measure r, telescope was my first idea. If i lived in 18th century i would use it.
    Sorry, i wasn't presice.
  6. Jul 26, 2005 #5
    Thank you both!!! Here's to solving!!
  7. Jul 26, 2005 #6


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    Several centuries ago, the radius of the Earth was found using the angles of the Sun rays formed on Earth. To find the mass you will probably have to use g=(G.m1.m2)/r^2. This means you will need the mass of another body, like the moon.

    Not sure how else you could find the Mass of the earth.
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