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Moons gravitational effect

  1. Oct 12, 2012 #1
    Hi all

    Looking for some assistance if possible.

    Astrophysics is not my field--so please be gentle with me, as I am totally ignorant in your discipline.

    I’m doing experiments with magnets and rotating devices and would like to include the effect of drag and pull of the moon (at max and min.) in my data for analysis.

    What I need is to know is were I could find information with regards to the earth and moons distance at any point in time.

    Also, the gravitational effects—example—at what point are they strongest and weakest.

    Are they strongest at the point of the moons nearest approach or as the moon starts to move away.

    I would like to be able to access the information ( —as in a database format ) at any point in time--eg. what would the value be --say--July 19, 2113 or August 05,2014.

    I would also like to chart the data over time.

    Any suggestions are greatly appreciated.

    Thanks in advance

  2. jcsd
  3. Oct 14, 2012 #2


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    What does the gravitational pull of the moon have to do with your experiment? How accurate are you measuring?

    The force is strongest when you are closest to the moon.

    I'm not sure if there is a database or something somewhere with the gravitational force of the Moon. However such a thing is easily calculated if you know the distance between you and the Moon, which only requires that you know the distance from the Moon to the Earth at the time.
  4. Oct 14, 2012 #3


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    greetings Rick
    welcome to PF

    I would suggest that any experiments with magnets and trying to measure very small variations of position etc are going to be more likely to be affected by variations in the Earth's magnetic field. Particularly at times of sudden impulses to the magnetic field during times of bursts of solar activity Coroma Mass Ejections and Flares.

    Do a google search on magnetometers. any observed/recorded variations are more likely to have been caused by the much stronger effectof the above rather than the much weaker minor variations of gravity

  5. Oct 19, 2012 #4
    Well one gravitation effect would be that the moon keeps the Earth from moving into the sun. One i only read about recently. AS the Earths pole would move further towards the sun This obviously would take millions of years to process regardless.

    Just an interesting fact non the less.
  6. Oct 19, 2012 #5


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    The Earth would not go spiraling into the Sun if it weren't for the Moon. We are in a stable orbit with or without it. The axis of the Earth's rotation may be a little more unstable, but that is not the same thing. Our distance from the Sun would remain the same.
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