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f CET was suddenly discovered by a group of cartographers around 1600 AD, was it discovered through experiment or through a new religion/philosophy? Science was extremely fledgling if non-existent in 1600 AD; although mankind may have been able to have reproduced something akin to the 1897 rectilinear experiment privately. The Rosicrucians for example were rumored to be scientifically far ahead of their time in the 1600s. What new philosophy or religion could have sprung up around 1600 AD to influence cartographers to produce cavity maps? At this time, neither religion nor experiment purporting Earth’s concavity is documented anywhere that I know of, but that is not to say these documents could perhaps exist or that the experiments were either deliberately not documented (private), or the documents have been lost.
