Arthur Train & Robert Wood 
The Man Who Rocked the Earth [EPUB ebook] 

THE MAN WHO ROCKED THE EARTH
"I thought, too, of the first and most significant realization which the reading of astronomy imposes: that of the exceeding delicacy of the world's position; how, indeed, we are dependent for life, and all that now is, upon the small matter of the tilt of the poles; and that we, as men, are products, as it were, not only of earth's precarious position, but of her more precarious tilt."—W. L. Comfort, Nov., 1914