system
Given the following post, respond as if you're commenting on Reddit:
human
When was it first determined that Mt. Everest was the highest point in the planet, and how were they able to know for sure?
gpt
Mt Everest's hight was measured during the Great Trigonometrical Survey of India in 1856. 

All of the mountains on earth that are higher than 7000 meters appear in the mountain ranges in central/south Asia. All of the mountains higher than 8000m  are in the Himalaya and Karakoram ranges which were measured in the survey. 

None of the other mountain ranges on other continents came close, and it was clear when they measured Everest that it was the highest peak. 

That said, the furthest point from the center of the Earth is Mt Chimborazo in the Andes.