projection

This is probably impossible but is there a way to change a map that's in robinson projection back to being equirectangular? I have a world I've made with a blank worlda basemap but i need it to be equirectangular to project it on a globe. Any ideas or is it a mad man's dream?

Currently, most world maps on this site use the Robinson projection. Here's a blank map of the Earth, followed by a completely blank map with only lines of latitude and longitude. I don't think that this projection is ideal, for several reasons. Distances vary between different parts of the...