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Why Experts Can't Agree on the Lengths of the World's Coastlines

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Measuring the distance between two places on a map is pretty straightforward. But if you want to calculate how long a shoreline is, things can get complicated. Just search "U.S. coastline length" and you'll find that results can vary by tens of thousands of miles.

How can cartographers come up with numbers that differ so wildly if they're all measuring the same thing? The answer, according to the video below from RealLifeLore, lies in a phenomenon called the Coastline Paradox.

Measuring the East Coast of the U.S. isn't the same as calculating the miles separating the tip of Florida from the tip of Maine. A coast doesn't follow a straight line. It's made up of divots and curves that start to multiply the closer you zoom in on the map. Accounting for every single detail of the coast is impossible. One, because the shore is always changing shape, and two, because these intricacies go all the way down to the molecular level.

That means cartographers have to pick a unit of measurement with which to estimate the length of the coast. If one team measures in miles and another measures in units of 100 miles, their results will look very different. Smaller measurements produce longer and, technically, more accurate numbers. But at some point, if you keep drilling down to smaller and smaller units, the length of a coastline appears to approach infinity—which doesn't seem entirely right, either. So every measurement of a coastline you see is really just a rough estimate.

The Coastline Paradox isn't the only complication that makes cartography an imperfect science. Even Mount Everest's title as the world's tallest mountain isn't totally uncontested.

Learn more about the Coastline Paradox in the video below.

[h/t RealLifeLore]

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Interactive Map Shows Where Your House Would Have Been 750 Million Years Ago
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Your neighborhood traveled a long way over several hundred million years to reach the spot it occupies today. To trace that journey over the ages, check out Ancient Earth, an interactive digital map spotted by Co.Design.

Ancient Earth, a collaboration between engineer and Google alum Ian Webster and Paleomap Project creator C.R. Scotese, contains geographical information for the past 750 million years. Start at the beginning and you'll see unrecognizable blobs of land. As you progress through the ages, the land mass Pangaea gradually breaks apart to form the world map we're all familiar with.

To make the transition even more personal, you can enter your street address to see where it would have been located in each period. Five hundred million years ago, for example, New York City was a small island in the southern hemisphere isolated from any major land mass. Around the same time, London was still a part of Pangaea, and it was practically on top of the South Pole. You can use the arrows on your keyboard to flip through the eras or jump from event to event, like the first appearance of multicellular life or the dinosaur extinction.

As you can see from the visualization, Pangaea didn't break into the seven continents seamlessly. Many of the long-gone continents that formed in the process even have names.

[h/t Co.Design]

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Why Macedonia Is Getting a New Name
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For the first time since becoming an independent nation in 1991, the Republic of Macedonia is rebranding itself. As CNN reports, the Balkan nation will soon be called the Republic of Northern Macedonia, a name change that will hopefully help to heal the country's tense relationship with Greece.

Macedonia adopted its former title after gaining independence from Yugoslavia 27 years ago, and the name immediately caused conflict. Its neighbor to the south, Greece has a region of its own called Macedonia. Greece claimed that Macedonia's name suggested a sense of entitlement to territory that belonged to them and took it as an insult.

Even decades later, the bad blood stirred by the decision remained. Greece's issue with the name has even prevented Macedonia from joining the European Union and NATO. The new title, which was agreed upon by Macedonian prime minister Zoran Zaev and Greek prime minister Alexis Tsipras on June 11, is meant to be a step towards better relations between the two countries.

"Our bid in the compromise is a defined and precise name, the name that is honorable and geographically precise—Republic of Northern Macedonia," Prime Minister Zaev said at a press conference, as reported by Reuters. Macedonia will hold a popular vote to officially change the name in a referendum later this year.

A country changing its name isn't uncommon, but reasons for the revision vary. In April 2018, the country formerly known Swaziland announced it would be called eSwatini, the name it went by prior to British colonization.

[h/t CNN]

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