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Thread: orbit

  1. #1 orbit 
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    does anyone here have the formula for the moons orbit around earth?


    when you have eliminated the impossible, whatever remains, however improbable, must be the truth
    A.C Doyle
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  3. #2  
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    What "formula" do you mean? The formula for the orbital period? http://en.wikipedia.org/wiki/Orbital_period


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  4. #3  
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    The orbit is an ellipse with eccentricity 0.0549.
    Is that what you want?
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  5. #4  
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    tahts not a formula.

    a formula is like this: orbit = x*(A+B*(K/F))
    when you have eliminated the impossible, whatever remains, however improbable, must be the truth
    A.C Doyle
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  6. #5  
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    I was offering to provide the mathematical equation for the Moon's orbit as an ellipse incorporating its eccentricity. That would surely meet your standard as a "formula." But clearly this is not what you want.

    If you ever find your answer somewhere, would you post it here? We would all like to see what someone really wants when he asks for such a formula.
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  7. #6  
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    Quote Originally Posted by SteveF
    I was offering to provide the mathematical equation for the Moon's orbit as an ellipse incorporating its eccentricity. That would surely meet your standard as a "formula." But clearly this is not what you want.

    If you ever find your answer somewhere, would you post it here? We would all like to see what someone really wants when he asks for such a formula.
    what you gave was a formula for the orbital path the moon takes around the earth.

    what i want is a formula showing why the moon orbits the earth in
    an ellipse with eccentricity 0.0549.
    you basically cannot put this into a computer, and get any results out.
    other than an ellipse with eccentricity 0.0549.

    i want a formula which i can derive the orbital path of the moon based on speed of the moon, mass of earth and moon, and initial position.
    a simplified 3-dimensional model, with length, width, and time is nice,
    a 4-dimensional model would be nicer.
    when you have eliminated the impossible, whatever remains, however improbable, must be the truth
    A.C Doyle
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  8. #7  
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    We are slowly getting there. You are not expressing yourself very clearly but there are now two likely possibilities. Either you want to retrace Isaac Newton's footsteps and to be able to derive the equation for the Moon's motion from basic observations, OR you are interested in astronavigation and interplanetary travel using Newton's results.

    For example, "If I launch my rocket at noon on Tuesday, where must I aim it to hit the Moon?"

    We should be able to help you with either problem but I warn you that neither one is simple. You need to tell us the level of your calculus. Are you experienced in differential equations? Polar coordinates?

    Before you reply, do some research on Newton's well-known two-body problem and then move on to the notorious Three-Body Problem. Good luck.

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