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Ptolemy proposed his refined geocentric model. In the Ptolemaic universe, a planet moves in a small circle called an epicycle, and the center of the epicycle moves along a larger circle around the Earth.
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Nicolaus Copernicus made a book called On The Revolutions of Heavenly Spheres. Also published just before his death.
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De humani corporis fabrica libri septem is a set of books on human anatomy written by Andreas Vesalius and published in 1543
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the Italian scientist Galileo Galilei is said to have dropped two spheres of different masses from the Leaning Tower of Pisa to demonstrate that their time of descent was independent of their mass.
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Francis Bacon's The Advancement of Learning is considered the first major philosophical book written in English.
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Kepler said all planets move about the Sun in elliptical orbits, having the Sun as one of the foci.
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The cell was first discovered and named by Robert Hooke in 1665.
