How does Mercury's orbit prove General Relativity?

When Einstein proposed his new theory of gravity in 1915 - his theory of General Relativity that massive objects curve space - he came up with three ways of testing his theory. One of those ways was whether it could properly predict the orbit of Mercury, which up until then, no theory of gravity had been able to do. So why is Mercury's orbit so odd?

Measuring the speed of light with marshmallows in a microwave: https://physicamechanica.wordpress.com/2013/12/04/speed-of-light-in-a-microwave/

Galle (1846) - http://articles.adsabs.harvard.edu/pdf/1846MNRAS...7..153G
Le Verrier (1859) - http://articles.adsabs.harvard.edu/pdf/1859AnPar...5....1L
Swift (1878) - http://articles.adsabs.harvard.edu/pdf/1878Obs.....2..161S
Einstein (1915) - https://www.kritik-relativitaetstheorie.de/Anhaenge/Einstein-Perihelbewegung-Merkur.pdf
Schwarzschild (1916) - http://articles.adsabs.harvard.edu/pdf/1916AbhKP1916..189S
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👩🏽‍💻 Dr Becky Smethurst is an astrophysicist researching galaxies and supermassive black holes at Christ Church at the University of Oxford.
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Видео How does Mercury's orbit prove General Relativity? канала Dr. Becky