Qualla: Ciudad Mitad del Mundo

Ciudad Mitad del Mundo: Introduction

Thu, 16 Apr 2026 00:00:00 GMT

Photo credit David A. Acosta S. from Bogotá, Colombia, CC BY 2.0. The yellow line painted down the middle of the plaza at Ciudad Mitad del Mundo is in the wrong place. Not by much - 240 meters, a little more than two football fields - but in the wrong place all the same. Tourists line up every day to straddle it for photos, one foot in each hemisphere. The equator they are actually straddling is a line painted on stone by Ecuadorian geographers who trusted the wrong measurements. The real equator, the one satellites have confirmed, runs just north of the monument, through what was probably a site of pre-Columbian astronomical observation. The story of how we got here is a story of French scientists, Andean mountaintops, and measurements that changed the world - nearly.

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Image: David A. Acosta S. from Bogotá, Colombia | CC BY 2.0

Ciudad Mitad del Mundo: The French Expedition

Thu, 16 Apr 2026 00:00:00 GMT

Photo credit CC BY-SA 3.0. In 1735, the French Academy of Sciences dispatched one of history's most ambitious scientific expeditions. Led by Louis Godin, Pierre Bouguer, and Charles Marie de La Condamine, the mission's assignment was to settle one of the great scientific questions of the age: was the Earth...

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Image: CC BY-SA 3.0

Ciudad Mitad del Mundo: What They Got Right

Thu, 16 Apr 2026 00:00:00 GMT

Photo credit Mr. Tickle, CC BY-SA 3.0. The expedition's core finding proved definitive: the Earth is oblate, flattened at the poles, just as Newton had predicted. Their measurements of arc length near the equator, compared against similar measurements in Lapland, confirmed a rotational bulge at the middle of the plane...

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Image: Mr. Tickle | CC BY-SA 3.0

Ciudad Mitad del Mundo: What They Got Wrong

Thu, 16 Apr 2026 00:00:00 GMT

Photo credit Maurice Chédel, Public domain. They were also, it turns out, about 240 meters off on the exact location of the equator. Given the instruments of 1736, this was not a bad result. Given what modern GPS can measure, it is an embarrassment that has outlasted the expedition by nearly three centuries. In 1936, the E...

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Image: Maurice Chédel | Public domain

Ciudad Mitad del Mundo: Catequilla and the Older Line

Thu, 16 Apr 2026 00:00:00 GMT

Photo credit Mr. Tickle, CC BY-SA 3.0. Here the story takes a turn. While the French were measuring the equator between 1735 and 1745, they passed by ruins that they did not recognize as significant. Those ruins, the archaeological site called Catequilla, were built by the Quitu-Cara culture that inhabited the region ...

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Image: Mr. Tickle | CC BY-SA 3.0

Ciudad Mitad del Mundo: Straddling the Line

Thu, 16 Apr 2026 00:00:00 GMT

Photo credit User: (WT-shared) Shoestring at wts wikivoyage, CC BY-SA 4.0. Today the site contains more than the monument. There is a planetarium, a miniature model of Quito, handicraft stores, cafes, and a small ethnographic museum inside the pyramid displaying indigenous clothing and cultural artifacts. Two hundred meters northeast is the privately op...

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Image: User: (WT-shared) Shoestring at wts wikivoyage | CC BY-SA 4.0