3207: Bad Map Projection: Zero Declination - Revision history

RG: removed incomplete notice

2026-05-15T01:56:20Z

removed incomplete notice

82.132.212.205: /* Transcript */ Not recent, but needed renormallising.

2026-05-14T15:54:26Z

‎Transcript: Not recent, but needed renormallising.

96.73.158.89 at 11:58, 14 May 2026

2026-05-14T11:58:18Z

GSLikesCats307 at 13:27, 24 March 2026

2026-03-24T13:27:04Z

2A02:AA10:EA7E:ED00:1DB7:DAC7:1294:DBB6: /* Explanation */ + orienteering maps

2026-02-19T01:37:58Z

‎Explanation: + orienteering maps

Alstocras: /* Explanation */ removed factorial; 2000! \approx 3.316275 \cdot 10^5735, even though in reality it is only 2000.

2026-02-18T07:27:26Z

‎Explanation: removed factorial; 2000! \approx 3.316275 \cdot 10^5735, even though in reality it is only 2000.

2A00:23C8:F529:1301:C8AE:DBC6:E488:D2C4: /* Explanation */ wrong word

2026-02-17T16:36:56Z

‎Explanation: wrong word

Qwertyuiopfromdefly: added category

2026-02-17T04:59:05Z

added category

130.44.160.197: fix md

2026-02-16T13:52:08Z

fix md

130.44.160.197: added Ahogue's amazing visualization!

2026-02-16T13:20:07Z

added Ahogue's amazing visualization!

← Older revision		Revision as of 01:56, 15 May 2026
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	==Explanation==		==Explanation==
−	~~{{incomplete\|This page was created recently by a misaligned map. Don't remove this notice too soon.}}~~
	This is the tenth comic in the [[:Category:Bad Map Projections\|Bad Map Projections]] series, displaying Bad Map Projection #216: Zero Declination.		This is the tenth comic in the [[:Category:Bad Map Projections\|Bad Map Projections]] series, displaying Bad Map Projection #216: Zero Declination.

@@ Line 28: / Line 28: @@
 {{incomplete transcript|Don't remove this notice too soon.}}
-[An outline map of the world is shown, with all landmasses  rotated & extended about - shown by sets of three red arrows around each change. A title on top of the map reads as follows: 'Bad Map Projection #216:', then below that: 'zero declination', & finally below that 'A cylindrical projection distorted so up is magnetic north'.]
+[An outline map of the world is shown, with all landmasses  rotated and extended about - shown by sets of three red arrows around each change. A title on top of the map reads as follows: 'Bad Map Projection #216:', then below that: 'zero declination', and finally below that 'A cylindrical projection distorted so up is magnetic north'.]
 {{comic discussion}}<noinclude>

@@ Line 28: / Line 28: @@
 {{incomplete transcript|Don't remove this notice too soon.}}
-[An outline map of the world is shown, with all landmases  rotated & extended about - shown by sets of three red arrows around each change. A title on top of the map reads as follows: 'Bad Map Projection #216:', then below that: 'zero declination', & finally below that 'A cylindrical projection distorted so up is magnetic north'.]
+[An outline map of the world is shown, with all landmasses  rotated & extended about - shown by sets of three red arrows around each change. A title on top of the map reads as follows: 'Bad Map Projection #216:', then below that: 'zero declination', & finally below that 'A cylindrical projection distorted so up is magnetic north'.]
 {{comic discussion}}<noinclude>

@@ Line 27: / Line 27: @@
 ==Transcript==
 {{incomplete transcript|Don't remove this notice too soon.}}
 {{comic discussion}}<noinclude>

← Older revision		Revision as of 01:37, 19 February 2026
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	You can see magnetic declination [https://www.ncei.noaa.gov/maps/historical-declination/ historical data here].		You can see magnetic declination [https://www.ncei.noaa.gov/maps/historical-declination/ historical data here].
		+
		+	In {{w\|orienteering}}, the maps are printed in such a way that magnetic north is always up - but given that the maps rarely show more than a few square kilometers, Randall's problem of mapping the entire world doesn't occur.

	==Transcript==		==Transcript==

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 The red arrows indicate the distortions from the starting map required to make Magnetic North be at the top.
-In the title text, "WMM2025" refers to the 2025 version of the {{w|World Magnetic Model}}, a representation of the Earth's magnetic field. You can see it [https://web.archive.org/web/20260212034745/https://www.ncei.noaa.gov/sites/default/files/inline-images/D.jpg here]. The "zero line" is in green, which shows where in the world magnetic declination is 0°. [[Randall]] has presumably wasted a day trying to figure out what year has had the most population living in an area of less than 5° declination by searching through previous WMM maps. He appears to have not found the answer, but luckily explainxkcd user Ahogue [[356|finished the job]] and made a [https://awhogue.github.io/zero-declination/output/ beautiful interactive map] to let you see that the answer is 2000!
+In the title text, "WMM2025" refers to the 2025 version of the {{w|World Magnetic Model}}, a representation of the Earth's magnetic field. You can see it [https://web.archive.org/web/20260212034745/https://www.ncei.noaa.gov/sites/default/files/inline-images/D.jpg here]. The "zero line" is in green, which shows where in the world magnetic declination is 0°. [[Randall]] has presumably wasted a day trying to figure out what year has had the most population living in an area of less than 5° declination by searching through previous WMM maps. He appears to have not found the answer, but luckily explainxkcd user Ahogue [[356|finished the job]] and made a [https://awhogue.github.io/zero-declination/output/ beautiful interactive map] to let you see that the answer is 2000.
 You can see magnetic declination [https://www.ncei.noaa.gov/maps/historical-declination/ historical data here].

@@ Line 15: / Line 15: @@
 While the Earth's magnetic field is broadly aligned North-South, the actual alignment of the magnetic field varies over time and position. The difference between True North (the axis of Earth's rotation) and Magnetic North (the direction a compass will point) will vary depending on your position, and is known as the {{w|Magnetic Declination}} of that point.
-The comic shows a map that has been distorted based on the Magnetic Declination such that Magnetic North for every point is pointed toward the top of the map. If this were reality, then Magnetic North would always be aligned with True North, or in other words, there would be Zero Declination at all points.
+The comic shows a map that has been distorted based on the Magnetic Declination so that Magnetic North for every point is pointed toward the top of the map. If this were reality, then Magnetic North would always be aligned with True North, or in other words, there would be Zero Declination at all points.
 The red arrows indicate the distortions from the starting map required to make Magnetic North be at the top.

← Older revision		Revision as of 04:59, 17 February 2026
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	[[Category:Comics with red annotations]]		[[Category:Comics with red annotations]]
	[[Category:Bad Map Projections]]		[[Category:Bad Map Projections]]
		+	[[Category:Comics with color]]