That would place the zeroth parallel on something else than the equator (the only great circle (https://en.wikipedia.org/wiki/Great_circle https://en.wikipedia.

That would place the zeroth parallel on something else than the equator (the only great circle (https://en.wikipedia.org/wiki/Great_circle https://en.wikipedia.org/wiki/Great_circle) that continuously gets mapped to itself as the earth rotates). I don’t think that was ever on the table, if only because it would make time reckoning difficult, and one of the goals of the International Meridian Conference was to create a “standard of time reckoning throughout the world” (https://en.wikipedia.org/wiki/International_Meridian_Conference https://en.wikipedia.org/wiki/International_Meridian_Confere...))