curprev18:2018:20, 4 January 2024 DVdmtalkcontribs 23,948 bytes−25 Undid revision 1193609672 by Pittsburgcarlos (talk) If there's only one subsection, it's better not to do that. There is no section *about* coordinate systems. But I added the word "in" to the original section header.
curprev22:3922:39, 27 October 2023 DVdmtalkcontribs 19,462 bytes−58 →Polar coordinates: Removing tagged unsourced claim, as it is not entirely the same anyway. VMG is just a sailing term and usually refers to a speed towards a goal. In this case the origin should not be regarded as such.