Is Epicyclic an Accurate Term for the Moon's Orbit Around the Sun?

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Homework Help Overview

The discussion revolves around the terminology used to describe the Moon's orbit around the Sun, specifically questioning whether the term "epicyclic" is appropriate. Participants reference historical contexts and seek clarification on the concept of epicycles in relation to celestial mechanics.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants explore the definition of epicyclic orbits and question the applicability of the term to the Moon's path. Some suggest considering the Moon's orbit in different reference frames, while others mention the historical context of epicycles.

Discussion Status

The discussion is ongoing, with participants providing insights and prompting further exploration of the concept. There is no explicit consensus, but the dialogue encourages deeper consideration of the terminology and its implications.

Contextual Notes

Some participants note the historical significance of epicycles and the potential for misunderstanding in modern contexts. The discussion hints at the complexity of orbital paths without resolving the appropriateness of the term "epicyclic."

Minki
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Hi, A quick clarification question. Is epicyclic a correct description for our moons path around the sun. I can only find references to epicycles in a historical context.

Thanks.
 
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Hi Minki! :smile:
Minki said:
I can only find references to epicycles in a historical context.

Epicycles are an approximation … the number of cycles gives you the order of the approximation.

The only actual epicylces I know of are what are usually called planetary gears, see http://en.wikipedia.org/wiki/Epicyclic_gearing :wink:
 
Focus on what it means for an orbit to be epicyclic and you can answer the question yourself.

example of a modern use.

But perhaps you are thinking that, maybe, the Moon's orbit (in, say, the reference frame of the Earth-Moon center-of-mass) traces out some sort of complicated scribble rather than a simple ellipse?
 
Ok, thanks for that guys.
 

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