Difference between revisions of "3207: Bad Map Projection: Zero Declination"

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[[Category:Bad Map Projections]]

Revision as of 03:10, 14 February 2026

Bad Map Projection: Zero Declination
'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.
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.

    Explanation

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    Transcript

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    Discussion

    First! Can't believe I'm north! King Pando (talk) 03:34, 14 February 2026 (UTC)

    What do you mean that you're north? This isn't a good name (talk) 03:42, 14 February 2026 (UTC)
    You’re north, I’m fourth :) Logalex8369 (talk) 04:53, 14 February 2026 (UTC)
    Hi fourth! i'm John 45.178.1.151 05:31, 14 February 2026 (UTC)

    I can't figure out what the red arrows are. My best guess is that they indicate the direction that the map was distorted in that area. It would be good if somebody would explain. Jordan Brown (talk) 04:07, 14 February 2026 (UTC)

    I think you are right. here's a rough (map comparison) Sameldacamel34 (talk) 05:41, 14 February 2026 (UTC)

    Wouldn't such a map actually be quite useful to anyone using only a compass to navigate? 2A06:C701:46AF:2C00:7577:585:1183:EFBD 07:37, 14 February 2026 (UTC)

    I'm confused by the cylindrical projection used for this. I would have expected him to use the geomagnetic dipole for the projection axis, but this would put Ellesmere Island at the top of the map, which is clearly incorrect. Instead he seems to have used the geometric axis for the projection (or maybe the axis between magnetic dip poles, which would be similar in 2025?). This joke would have been better 20 years ago when the dip pole was solidly in Canada. Quantum7 (talk) 08:35, 14 February 2026 (UTC)
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