User talk:2603:7000:801:1143:5D0E:70BF:5250:D0E1

Mercator projection in the Song Dynasty?
Hi and welcome to Wikipedia. Your recent edit about maps in Song Dynasty China possibly being based on the same principle as the Mercator projection was reverted, which I think was on balance the right decision, but our existing text about this could be improved. You might want to chime in at the discussion I started, –jacobolus (t) 18:14, 6 November 2023 (UTC)