I am no expert when it comes to maps, but does anyone know which map type the latitude and longitude values provided with the (free) MaxMind database of cities belong to? Are they a Miller cylindrical projection, Mercator projection or any of the other map types (https://en.wikipedia.org/wiki/Map_projection#Cylindrical)?
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Like Mark said, the latitude and longitude values are generic. Depending on the projection you transform them appropriately.