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The Earth resolves around the Sun or the Sun revolves around the Earth

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2

$begingroup$

Well, in today's world we know that the earth resolves around the sun. But that is seen from frame of reference of sun or an observer stationary wrt sun.

From frame of reference of the earth, sun revolves around earth. But why modern physics says one is right while the other is wrong?

Shouldn't both be correct? As relativity says no frame of reference is special. And if we are very specific, both of them revolve around each other.

reference-frames orbital-motion inertial-frames solar-system celestial-mechanics

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edited 4 hours ago

Qmechanic♦

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asked 5 hours ago

sakurasakura

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add a comment | 

2

$begingroup$

Well, in today's world we know that the earth resolves around the sun. But that is seen from frame of reference of sun or an observer stationary wrt sun.

From frame of reference of the earth, sun revolves around earth. But why modern physics says one is right while the other is wrong?

Shouldn't both be correct? As relativity says no frame of reference is special. And if we are very specific, both of them revolve around each other.

reference-frames orbital-motion inertial-frames solar-system celestial-mechanics

share|cite|improve this question

edited 4 hours ago

Qmechanic♦

109k122051271

asked 5 hours ago

sakurasakura

111

New contributor

sakura is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

$endgroup$

add a comment | 

$begingroup$

Well, in today's world we know that the earth resolves around the sun. But that is seen from frame of reference of sun or an observer stationary wrt sun.

From frame of reference of the earth, sun revolves around earth. But why modern physics says one is right while the other is wrong?

Shouldn't both be correct? As relativity says no frame of reference is special. And if we are very specific, both of them revolve around each other.

reference-frames orbital-motion inertial-frames solar-system celestial-mechanics

share|cite|improve this question

edited 4 hours ago

Qmechanic♦

109k122051271

asked 5 hours ago

sakurasakura

111

New contributor

sakura is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

$endgroup$

share|cite|improve this question

edited 4 hours ago

Qmechanic♦

109k122051271

asked 5 hours ago

sakurasakura

111

New contributor

sakura is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

share|cite|improve this question

edited 4 hours ago

Qmechanic♦

109k122051271

asked 5 hours ago

sakurasakura

111

New contributor

sakura is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

edited 4 hours ago

Qmechanic♦

109k122051271

edited 4 hours ago

Qmechanic♦

109k122051271

asked 5 hours ago

sakurasakura

111

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sakura is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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asked 5 hours ago

sakurasakura

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2 Answers
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5

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Considering only the Earth and the Sun, they both revolve around their center of mass. But since the Sun so much more massive, their center of mass is much closer to the Sun than to the Earth. So close, in fact, that it is well within the body of the Sun, just 280 miles from the center.

So the Sun just wiggles a bit, its center moving in a tiny 280-mile-radius “orbit” around that COM. By contrast, the Earth’s orbit has a radius of 93 million miles. Relative to the COM, the Sun’s acceleration is tiny compared with that of the Earth, so we tend to think of the Sun as more or less stationary and the Earth as revolving around it.

The center of mass of the solar system is also accelerating, due to the gravitation in our Milky Way galaxy. And the center of mass of the galaxy is accelerating due to the gravitation in our local cluster of galaxies.

share|cite|improve this answer

edited 5 hours ago

answered 5 hours ago

G. SmithG. Smith

13k12045

$endgroup$

add a comment | 

1

$begingroup$

This is to point out one key error in your thought process.

As relativity says no frame of reference is special.

(Classical) relativity says that no inertial frame of reference is special.

The frame of reference that has the Earth stationary is not an inertial frame, because the Earth must accelerate to maintain (roughly) circular motion around the sun.

The reference frame that has the Sun stationary is also not strictly an inertial frame, since the Sun is orbiting around the galactic center. But the acceleration associated with that orbit is affecting the Earth as much as it is the Sun, so the errors resulting in treating this frame as an approximately inertial frame are not significant in the analysis of the Sun-Earth system.

share|cite|improve this answer

answered 4 hours ago

The PhotonThe Photon

10.2k11935

$endgroup$

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  The Sun also orbits Sun-Earth center of mass, which may be more important than acceleration due to orbiting the galactic center. But anyway, if we use General Relativity, both the Sun and the Earth are in free fall, so corresponding frames of reference are both inertial.
  $endgroup$
  – Ruslan
  3 hours ago
  
  

  
  
  
  

add a comment | 

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5

$begingroup$

Considering only the Earth and the Sun, they both revolve around their center of mass. But since the Sun so much more massive, their center of mass is much closer to the Sun than to the Earth. So close, in fact, that it is well within the body of the Sun, just 280 miles from the center.

So the Sun just wiggles a bit, its center moving in a tiny 280-mile-radius “orbit” around that COM. By contrast, the Earth’s orbit has a radius of 93 million miles. Relative to the COM, the Sun’s acceleration is tiny compared with that of the Earth, so we tend to think of the Sun as more or less stationary and the Earth as revolving around it.

The center of mass of the solar system is also accelerating, due to the gravitation in our Milky Way galaxy. And the center of mass of the galaxy is accelerating due to the gravitation in our local cluster of galaxies.

share|cite|improve this answer

edited 5 hours ago

answered 5 hours ago

G. SmithG. Smith

13k12045

$endgroup$

add a comment | 

5

$begingroup$

Considering only the Earth and the Sun, they both revolve around their center of mass. But since the Sun so much more massive, their center of mass is much closer to the Sun than to the Earth. So close, in fact, that it is well within the body of the Sun, just 280 miles from the center.

So the Sun just wiggles a bit, its center moving in a tiny 280-mile-radius “orbit” around that COM. By contrast, the Earth’s orbit has a radius of 93 million miles. Relative to the COM, the Sun’s acceleration is tiny compared with that of the Earth, so we tend to think of the Sun as more or less stationary and the Earth as revolving around it.

The center of mass of the solar system is also accelerating, due to the gravitation in our Milky Way galaxy. And the center of mass of the galaxy is accelerating due to the gravitation in our local cluster of galaxies.

share|cite|improve this answer

edited 5 hours ago

answered 5 hours ago

G. SmithG. Smith

13k12045

$endgroup$

add a comment | 

$begingroup$

Considering only the Earth and the Sun, they both revolve around their center of mass. But since the Sun so much more massive, their center of mass is much closer to the Sun than to the Earth. So close, in fact, that it is well within the body of the Sun, just 280 miles from the center.

So the Sun just wiggles a bit, its center moving in a tiny 280-mile-radius “orbit” around that COM. By contrast, the Earth’s orbit has a radius of 93 million miles. Relative to the COM, the Sun’s acceleration is tiny compared with that of the Earth, so we tend to think of the Sun as more or less stationary and the Earth as revolving around it.

The center of mass of the solar system is also accelerating, due to the gravitation in our Milky Way galaxy. And the center of mass of the galaxy is accelerating due to the gravitation in our local cluster of galaxies.

share|cite|improve this answer

edited 5 hours ago

answered 5 hours ago

G. SmithG. Smith

13k12045

$endgroup$

share|cite|improve this answer

edited 5 hours ago

answered 5 hours ago

G. SmithG. Smith

13k12045

answered 5 hours ago

G. SmithG. Smith

13k12045

answered 5 hours ago

G. SmithG. Smith

13k12045

1

$begingroup$

This is to point out one key error in your thought process.

As relativity says no frame of reference is special.

(Classical) relativity says that no inertial frame of reference is special.

The frame of reference that has the Earth stationary is not an inertial frame, because the Earth must accelerate to maintain (roughly) circular motion around the sun.

The reference frame that has the Sun stationary is also not strictly an inertial frame, since the Sun is orbiting around the galactic center. But the acceleration associated with that orbit is affecting the Earth as much as it is the Sun, so the errors resulting in treating this frame as an approximately inertial frame are not significant in the analysis of the Sun-Earth system.

share|cite|improve this answer

answered 4 hours ago

The PhotonThe Photon

10.2k11935

$endgroup$

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  The Sun also orbits Sun-Earth center of mass, which may be more important than acceleration due to orbiting the galactic center. But anyway, if we use General Relativity, both the Sun and the Earth are in free fall, so corresponding frames of reference are both inertial.
  $endgroup$
  – Ruslan
  3 hours ago
  
  

  
  
  
  

add a comment | 

1

$begingroup$

This is to point out one key error in your thought process.

As relativity says no frame of reference is special.

(Classical) relativity says that no inertial frame of reference is special.

The frame of reference that has the Earth stationary is not an inertial frame, because the Earth must accelerate to maintain (roughly) circular motion around the sun.

The reference frame that has the Sun stationary is also not strictly an inertial frame, since the Sun is orbiting around the galactic center. But the acceleration associated with that orbit is affecting the Earth as much as it is the Sun, so the errors resulting in treating this frame as an approximately inertial frame are not significant in the analysis of the Sun-Earth system.

share|cite|improve this answer

answered 4 hours ago

The PhotonThe Photon

10.2k11935

$endgroup$

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  The Sun also orbits Sun-Earth center of mass, which may be more important than acceleration due to orbiting the galactic center. But anyway, if we use General Relativity, both the Sun and the Earth are in free fall, so corresponding frames of reference are both inertial.
  $endgroup$
  – Ruslan
  3 hours ago
  
  

  
  
  
  

add a comment | 

$begingroup$

This is to point out one key error in your thought process.

As relativity says no frame of reference is special.

(Classical) relativity says that no inertial frame of reference is special.

The frame of reference that has the Earth stationary is not an inertial frame, because the Earth must accelerate to maintain (roughly) circular motion around the sun.

The reference frame that has the Sun stationary is also not strictly an inertial frame, since the Sun is orbiting around the galactic center. But the acceleration associated with that orbit is affecting the Earth as much as it is the Sun, so the errors resulting in treating this frame as an approximately inertial frame are not significant in the analysis of the Sun-Earth system.

share|cite|improve this answer

answered 4 hours ago

The PhotonThe Photon

10.2k11935

$endgroup$

share|cite|improve this answer

answered 4 hours ago

The PhotonThe Photon

10.2k11935

answered 4 hours ago

The PhotonThe Photon

10.2k11935

answered 4 hours ago

The PhotonThe Photon

10.2k11935