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Updated: May 4, 2025
They had ascertained the dimensions of the earth; they had registered or catalogued all the stars visible in their heavens, giving to those of the larger magnitudes the names they still bear on our maps and globes; they determined the true length of the year, discovered astronomical refraction, invented the pendulum-clock, improved the photometry of the stars, ascertained the curvilinear path of a ray of light through the air, explained the phenomena of the horizontal sun and moon, and why we see those bodies before they have risen and after they have set; measured the height of the atmosphere, determining it to be fifty-eight miles; given the true theory of the twilight, and of the twinkling of the stars.
Galileo set to work timing and measuring these oscillations, and he found that they were always done in exact measure and in perfect rhythm. This led, some years later, to perfecting an astronomical clock for measuring movements of the stars. And from this was originated the pendulum-clock, where before we had depended on sundials.
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