Earth Sciences 2123F/G Lecture Notes - Lecture 19: Reduced-Gravity Aircraft, Nicolaus Copernicus, Semi-Major And Semi-Minor Axes
1 Dec 2016
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Aristole defined four basic elements earth, water, air and fire. Objects move toward their own elemental sphere rocks fall to earth. Proof that heavier objects fall faster than lighter ones. Nicolaus copernicus proposed that earth orbits the sun- along with the rest of the planets. Johannes kepler discovered three laws of planetary motion the third la(cid:449) relates a pla(cid:374)et"s orbital period to semi-major axis of its orbit. All masses fall with the same acceleration due to gravity. In 1589 galileo dropped two balls of different masses from the leaning tower of pisa to demonstrate that their time of descent was independent of their mass. This experiment has been confirmed countless times including the moon. Based o(cid:374) kepler"s la(cid:449), ne(cid:449)to(cid:374) for(cid:373)ulated the. Universal law of gravitation: published in 1687 in philosophiae. The force of gravity is nearly equal everywhere on the surface of earth and points towards its center.
