Talk:vertical

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I've included both the plumbline definition as well as the line through the center of the Earth. They're not the same- they would be the same if the Earth was spherical, but the gravity field (that is followed by the plumbline) isn't actually radial.Wolfkeeper 17:04, 3 August 2008 (UTC)[reply]

Strictly, vertical walls are never parallel on the surface of a spherical planet[edit]

https://en.wikipedia.org/wiki/Vertical_and_horizontal#/media/File:Vertical_wall_are_never_parallel.PNG Backinstadiums (talk) 12:23, 13 January 2023 (UTC)[reply]

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