pickMy enthusiasm for this book is only slightly dimmed by not really understanding most of its almost 100 years old contents!
Eddington was responsible for championing Einstein's theory of relativity at a time when supporting a German citizen's work could be seen as unpatriotic, if not treasonous, especially as Eddington was a Quaker and a WWI conscientious objector. He was the first to experimentally prove Einstein's theory's ability to predict ⬇️
"That part of our conscious experience representable by physical symbols ought not to claim to be the whole. As a conscious being *you* are not one of my symbols; your domain is not circumscribed by my spatial measurements. If, like Hamlet, you count yourself king of an infinite space, I do not challenge your sovereignty. I only invite attention to certain disquieting rumours which have arisen as to the state of Your Majesty's nutshell.”
“I can see no more reason for preferring the theories of fifty years ago than for preferring the observational data of fifty years ago.”
I'm pleasantly surprised to find that far from giving a dry, heavy exposition of maths & physics, Eddington leavens his book with thoughts on the philosophy of science, & with quotes from Shakespeare & Dante. He was a popular communicator of science to the general public, and if this adaptation of a lecture ⬇️
First published in 1933, my edition is a Pelican reprint dated November 1941, describing the then fairly novel theory that the universe is expanding. Concepts of the form of expansion already included the Big Bang Theory and the Steady State Theory, though it was a few more years before either of those terms were coined. It will be interesting to see whether Sir Arthur backed the winning horse, TBBT 🎇 (sorry, spoilers again! 😄)
The Expanding Universe | 
I've enjoyed learning about his work and life, and there's a bit about him in this BBC article: https://www.bbc.co.uk/news/science-environment-48369980 4w