Moon's Orbit: The Science Behind Its Path

  • Context: High School 
  • Thread starter Thread starter Ahmed Samra
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    Orbit Path Science
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Discussion Overview

The discussion revolves around the factors influencing the moon's orbit, particularly focusing on gravitational influences from the Earth and the Sun, as well as the implications of different reference frames. Participants explore the complexities of modeling the moon's path, including considerations of accuracy and the unique characteristics of the Earth-moon system.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • Some participants propose that the moon's orbit primarily depends on Earth's gravity and its distance from Earth.
  • Others argue that the Sun's gravitational influence is also significant, particularly when considering different reference frames.
  • A participant suggests that the level of accuracy desired in a model affects the relevance of the Sun's influence.
  • There is a discussion about the Earth-moon system being special due to the Sun's contribution to the gravitational forces acting on the moon.
  • Some participants raise the question of whether the model accounts for the non-inertial frames of the Earth and the moon.
  • One participant introduces the idea that the moon's own gravity, due to its relatively large mass compared to other satellites, also plays a role in its orbital dynamics, particularly in relation to tidal effects.
  • A later reply reiterates the importance of including the Sun in the model to better understand the moon's orbit.

Areas of Agreement / Disagreement

Participants express differing views on the significance of the Sun's gravitational influence and the implications of reference frames, indicating that multiple competing perspectives remain without a clear consensus.

Contextual Notes

Limitations include the potential neglect of non-inertial frame effects in simpler models and the varying levels of accuracy required for different modeling approaches.

Ahmed Samra
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Does the moon's orbit depends mainly on the gravity of Earth and the distance between it and between earth?
 
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Right.
The sun can be relevant, too, depending on your reference frame.
 
depending on your reference frame? I think it would be rather the level of accuracy desired in your model.
 
The level of accuracy is important, too.

The earth/moon system is special:
If you calculate the gravitational forces on the moon, the largest contribution comes from the sun. In the reference frame of the sun, the path of the moon is always bent towards the sun. To see that the moon orbits the earth, you have to look at its position relative to earth, and ignore the common orbit of earth+moon around the sun.
 
Hmm..does this model consider the fact that the moon and the Earth are non-inertial frames?
 
I might be off-base in mentioning this, but it appears to me that there's another factor which is unusual in orbital situations. The moon is so huge in comparison to other satellites as to mass relative to the host planet, it's own gravity has a pretty strong influence as well (thinking of tides here).
 
HomogenousCow said:
Hmm..does this model consider the fact that the moon and the Earth are non-inertial frames?
That is the point of my post. A simple model with just earth+moon neglects this, you get a better model if you include the sun.
 

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