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Thinking about that Hellenistic world knew Earth was round, and had a good guess of circumference of the World. How about giving them something extra to try to kick their assess into Age of Discovery eventually.

So, somewhere in Rome or pre Rome Hellenistic states, or India or China astrolabe and quadrant are invented and start to be used before 100BC. I don't see anything about them demanding them be discovered only in middle ages. Sextant and octant are different story, and require knowledge of optics ancient world didnt have.

What I hope to achieve with this POD. Better navigation, opportunity to build better ships, that eventaully demand better navigation... => Age of Discovery, eventually.
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