Timeline for Do the forces between Earth and Sun point in the directions that the Earth and the Sun were 8 minutes ago?
Current License: CC BY-SA 4.0
7 events
| when toggle format | what | by | license | comment | |
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| Mar 10, 2020 at 5:05 | comment | added | A.V.S. | Carlip's paper in my answer would do. But to see that EM and gravity are different in that regard one could also use post-Newtonian expansion: system of charges is conservative up to $1/c^2$ terms while system of gravitating bodies is conservative up to $1/c^4$. Radiative effects appear at $1/c^3$ for EM and at $1/c^5$ for gravity. | |
| Mar 9, 2020 at 22:50 | comment | added | J Thomas | @A.V.S It sounds like there's something here I ought to learn about. Would you suggest a link? | |
| Mar 9, 2020 at 22:48 | history | edited | J Thomas | CC BY-SA 4.0 |
Fixed errors
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| Mar 9, 2020 at 22:26 | comment | added | J Thomas | You're right the forces are equal. I should have said that the sun's response to that force is small, compared to the earth's response. | |
| Mar 9, 2020 at 14:57 | comment | added | Agnius Vasiliauskas | The force on the sun from the earth -- kind of small Wrong. Have you ever checked Newton gravity law ? It states that gravity force is proportional to the product of masses : $F=G{\frac {m_{1}m_{2}}{r^{2}}}$. So force from sun to earth and from earth to sun are equal in magnitude. | |
| Mar 9, 2020 at 14:43 | comment | added | A.V.S. | This is wrong. For EM field “effective position” is linearly extrapolated. For gravitational field this “effective position” is extrapolated quadratically, taking into account not only velocity but also acceleration. | |
| Mar 9, 2020 at 9:12 | history | answered | J Thomas | CC BY-SA 4.0 |