Exactly, which is why it really grinds my gears when people try to present the map as intentionally amplifying some countries at the expense of others. That’s not the point, it’s just a side effect of inventing the first map that could actually be used for long-distance navigation.
For the UN it makes complete sense to use a different projection.
The maps were very accurate in terms of latitude (north/south position) which meant ships could find a particular port or harbor even if they had only a rough idea of their longitude (east/west position) by sailing along the latitude lines until they hit land. How big it made a particular piece of land look was irrelevant.
It’s not well known, but maps started to become super-accurate in terms of longitude as well in the 1670s or thereabouts. Astronomers had observed that Jupiter had eclipses of its moons about a thousand times a year, and thanks to Isaac Newton and others they were able to predict the exact times (in Greenwich England) of these eclipses a few years in advance and publish them. Observers around the world with good telescopes could view these eclipses and note the time differences between their observations and the published Greenwich times and use this to precisely calculate their longitude. It was not really possible to do this reliably on board a sailing ship because of the difficulty of keeping a high-powered telescope trained on Jupiter on a pitching and rolling deck (although many attempts were made) so this led to accurate maps but still not fully accurate navigation until the perfection of ship’s clocks a century later.
The other thing is on the Mercator, if you measure from point A to point B, and it gives you a compass heading, this is the correct compass heading to use to navigate to point B from point A. This is not true unless a map is designed for this purpose.
It won’t necessarily be the shortest distance – to plot that out, it is best to use a globe and chart the arc of a great circle path, which is a straight line on the curved surface of the earth. But that path will have the compass changing all the time.
If you are navigating by compass, which ships and airplanes had to do more often way back when, the mercator was great.
Posting for the benefit of @AAA@feddit.org and anyone else who didn’t know.
Moral of the story: pretty much every decision is made for logical reasons. Sometimes the reasons are unclear, motivations are selfish, or circumstances later change such that the decision is no longer sound, but it’s very rare that “they’re just stupid” is the cause.
Don’t worry about vote score and just block obvious assholes.
(To be clear, I wasn’t trying to be snarky to you specifically. There’s just a lot of people in this thread acting like literally the only reason the Mercator projection is used is because of racism.)
The map is extremely accurate in the sense that a course plotted on the map can be followed by following a compass course. The same does not apply for earlier maps, or by far most modern maps that are designed to match real-world sizes.
The reason the Mercator projection became the standard is that it was, for a long time, the only map you could use to safely navigate long distances, especially across oceans.
Exactly, which is why it really grinds my gears when people try to present the map as intentionally amplifying some countries at the expense of others. That’s not the point, it’s just a side effect of inventing the first map that could actually be used for long-distance navigation.
For the UN it makes complete sense to use a different projection.
How does an inaccurate map work in favor of long distance navigation? Genuinely curious because I fail to see any benefit.
The only advantage I see is you can read all the small countries on the map, which you may not be able to on more realistic maps.
The maps were very accurate in terms of latitude (north/south position) which meant ships could find a particular port or harbor even if they had only a rough idea of their longitude (east/west position) by sailing along the latitude lines until they hit land. How big it made a particular piece of land look was irrelevant.
It’s not well known, but maps started to become super-accurate in terms of longitude as well in the 1670s or thereabouts. Astronomers had observed that Jupiter had eclipses of its moons about a thousand times a year, and thanks to Isaac Newton and others they were able to predict the exact times (in Greenwich England) of these eclipses a few years in advance and publish them. Observers around the world with good telescopes could view these eclipses and note the time differences between their observations and the published Greenwich times and use this to precisely calculate their longitude. It was not really possible to do this reliably on board a sailing ship because of the difficulty of keeping a high-powered telescope trained on Jupiter on a pitching and rolling deck (although many attempts were made) so this led to accurate maps but still not fully accurate navigation until the perfection of ship’s clocks a century later.
The other thing is on the Mercator, if you measure from point A to point B, and it gives you a compass heading, this is the correct compass heading to use to navigate to point B from point A. This is not true unless a map is designed for this purpose.
It won’t necessarily be the shortest distance – to plot that out, it is best to use a globe and chart the arc of a great circle path, which is a straight line on the curved surface of the earth. But that path will have the compass changing all the time.
If you are navigating by compass, which ships and airplanes had to do more often way back when, the mercator was great.
Posting for the benefit of @AAA@feddit.org and anyone else who didn’t know.
Thanks a lot for the explanation. I had no idea, but now with that knowledge it’s quite obvious why and how it works with that kind of map.
Moral of the story: pretty much every decision is made for logical reasons. Sometimes the reasons are unclear, motivations are selfish, or circumstances later change such that the decision is no longer sound, but it’s very rare that “they’re just stupid” is the cause.
Didn’t think so, I just didn’t knew the reason. Therefore I asked.
Now I’m annoyed that I got downvoted for asking at all. What’s the moral there? Don’t ask questions?
Don’t worry about vote score and just block obvious assholes.
(To be clear, I wasn’t trying to be snarky to you specifically. There’s just a lot of people in this thread acting like literally the only reason the Mercator projection is used is because of racism.)
The map is extremely accurate in the sense that a course plotted on the map can be followed by following a compass course. The same does not apply for earlier maps, or by far most modern maps that are designed to match real-world sizes.
The reason the Mercator projection became the standard is that it was, for a long time, the only map you could use to safely navigate long distances, especially across oceans.