Name or Label for the outermost point of a rotating object

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The discussion revolves around the terminology used to describe the outermost point of an object's rotation, contrasting it with the term "Pivot," which refers to the rotational axis. A participant expresses frustration over the lack of answers and suggests that the question is both worthy and complex. They propose that for perfectly round objects, the outermost point can be referred to as the "sphere," while for irregular shapes, terms like "Maximum Diameter" or "Maximum Radius" could be used, although these are not official terms. The conversation also touches on specific terms related to planetary orbits, such as perihelion and aphelion, indicating a desire for a more technical name for the outermost point in general contexts.
Blizzardchris
Hey all, I can't seem to find the answer anywhere, I'm not sure if I'm asking the right question though, if the name or label "Pivot" describes the rotational axis of an object is there a term or label used to describe the outer most point of the rotation?
 
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I see no one answered your question. I’m new to PF but think when there are no answers to a question that means the question is not worthy or is too difficult. For me, I think your question is worthy and too difficult but that never stopped me from answering as long as I admit up front that it is wobbly and for entertainment only. I am a retired engineer who early on found I was better at managing engineers than doing engineering so they made me the pointy haired boss. But I love science and especially physics.
If the object is a perfectly round then the outermost point is located everywhere on the surface and is called the “sphere” (as well as everything inside). For irregular shapes like a five sided polygon—I couldn’t find an answer. It may well be called, “The outermost point”. Really though, it should have a more techy name than that.
 
How about "Maximum Diameter"; or perhaps "Maximum Radius"?

Not 'official', but they seem to get the idea across for some situations.

Cheers,
Tom
 
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