xkcd #3207: Bad Map Projection: Zero Declination

Title text:

‘The zero line in WMM2025 passes through a lot of population centers; I wonder what year the largest share of the population lived in a zone of less than 5° of declination,’ he thought, derailing all other tasks for the rest of the day.

Transcript:

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Source: https://xkcd.com/3207/

explainxkcd for #3207