Volume 56, Number 16 · October 22, 2009
The Missions of Astronomy
By Steven Weinberg
A few years ago, I decided that I needed to know more about the history of science, so naturally I volunteered to teach the subject. In working up my lectures, I was struck with the fact that in the ancient world, astronomy reached what from a modern perspective was a much higher level of accuracy and sophistication than any other science.[1] One obvious reason for this is that visible astronomical phenomena are much simpler and easier to study than the things we can observe on the earth's surface. The ancients did not know it, but the earth and moon and planets all spin at nearly constant rates, and they travel in their orbits under the influence of a single dominant force, that of gravitation.
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