ASTR 20 Lecture Notes - Lecture 4: Lucretius, Epicurus, Deferent And Epicycle
Document Summary
Records ideas of epicurus in poetic form. Bad things in life are mainly due to ignorance. Teach people truth about the nature of things. The earth and the sun are merely possible points of view from which the celestial. There has to be some sensible definition and agreement on what is chosen as fixed. If the earth is rotating sufficiently uniformly, a stone dropped from the tower will fall straight to the base, just as a stone dropped from the mast uniformly moving ship with fall to the foot of the mast. In both cases the stones vertical motion will be smoothly composed with. The position and time of physical events can be placed in this coordinate system. People in one country know little or nothing about people or ideas elsewhere. Most is all thought in china and what is now the middle east. Barbarians, hordes, warrior-kings and empire building is a major aspiration of.
