He is the first person credited with “weighing” the Earth.
Reference Source:
[1] Wikipedia Contributors. “Henry Cavendish.” Wikipedia, Wikimedia Foundation, 3 Oct. 2021, en.wikipedia.org/wiki/Henry_Cavendish. Accessed 16 Oct. 2021.
[2] “How Did Mankind First Determine the Mass of the Earth? | Science Guys | Union University, a Christian College in Tennessee.” Uu.edu, https://www.uu.edu/dept/physics/scienceguys/2002June.cfm. Accessed 16 Oct. 2021.