I think the link you want is https://en.wikipedia.org/wiki/Liquid-mirror_telescope https://en.wikipedia.org/wiki/Liquid-mirror_telescope - "The liquid and its c

I think the link you want is https://en.wikipedia.org/wiki/Liquid-mirror_telescope https://en.wikipedia.org/wiki/Liquid-mirror_telescope - "The liquid and its container are rotated at a constant speed around a vertical axis, which causes the surface of the liquid to assume a paraboloidal shape. This parabolic reflector can serve as the primary mirror of a reflecting telescope." This method in this article uses the same principle: “It has long been known that rotating liquids that are aligned with the local gravitational axis will naturally form a paraboloid surface shape,...“ See also https://en.wikipedia.org/wiki/Liquid-mirror_space_telescope https://en.wikipedia.org/wiki/Liquid-mirror_space_telescope .