4 years, 3 months ago

Why did Mount Everest’s height change?

Here is why China and Nepal agree on a new standard height for Mount Everest. China and Nepal agreed this week on a new standard height for Mount Everest, the rugged Himalayan peak that straddles their border. The countervailing forces may help maintain a degree of stability over time, said Dang Yamin, a member of a Chinese team that surveyed Everest’s height earlier this year. Last year, a Nepalese team set up a satellite navigation marker on Everest’s peak to gauge its exact position via GPS satellites. At the same time, Nepalese crews took measurements with modern, laser-equipped versions of instruments called theodolites, first used to gauge the mountain’s height in 1856 by measuring angles using trigonometry.

Al Jazeera

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