NATS 1745 Lecture Notes - Lecture 11: Messier Object, Inverse-Square Law, Edmond Halley
22 Jul 2017
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Gave a set of mathematical laws, which describe: Comprehensive and accurate mathematical model (newton"s laws of motion and gravity) + tech of telescope (refracting and reflecting) = many new astronomical discoveries. Sun, mercury, venus, earth (moon), mars, jupiter, saturn. Saturn observed by galileo, noticed it had rings (called them ears) thought they might be moons. Compared observations of saturn by galileo, scheiner, hevelius, and others (from. Reason we get diff views of saturn depending on when we look at it has to do with orientation of saturn and earth. First to understand that the various images of saturn result from it having a ring (1655) He showed with his diagram that the various views of saturn result from the orbital motion of the earth and saturn, as well as the axial tilts of both earth and saturn. This produces the cyclical pattern of change in saturn"s appearance. Later observations of saturn with more powerful telescopes.
