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https://en.wikipedia.org/wiki/Schwarzschild_metric
Schwarzschild metric
From Wikipedia
In Einstein's theory of general relativity, the Schwarzschild metric (also known as the Schwarzschild solution) is an exact solution to the Einstein field equations that describes the gravitational field outside a spherical mass, on the assumption that the electric charge of the mass, angular momentum of the mass, and universal cosmological constant are all zero. The solution is a useful approximation for describing slowly rotating astronomical objects such as many stars and planets, including Earth and the Sun. It was found by Karl Schwarzschild in 1916.
According to Birkhoff's theorem, the Schwarzschild metric is the most general spherically symmetric vacuum solution of the Einstein field equations. A Schwarzschild black hole or static black hole is a black hole that has neither electric charge nor angular momentum (non-rotating). A Schwarzschild black hole is described by the Schwarzschild metric, and cannot be distinguished from any other Schwarzschild black hole except by its mass.
The Schwarzschild black hole is characterized by a surrounding spherical boundary, called the event horizon
https://archive.org/details/sitzungsberichte1916deutsch/page/188/mode/2up?view=theater
From 1/13/1916 ( ) To 2/10/1975 ( ) is 21578 days
From 11/2/1965 ( my known birth date in Antlers, Oklahoma, USA, as Kerry Wayne Burgess ) To 11/30/2024 ( Today - Saturday ) is 21578 days
https://papersofprinceton.princeton.edu/princetonperiodicals/?a=d&d=Princetonian19750210-01.1.6&e=-------en-20--1--txt-txIN-------
- by me, Kerry Wayne Burgess, posted by me: 5:40 PM Pacific-timezone USA Saturday 11/30/2024
