PHY 102 1nd Edition Lecture 1 Outline of Current Lecture I Humankind has always been in contact with surroundings A Senses a Outside World i Celestial ii Terrestrial iii In between II Gods were created a Priests III Astronomy a How it began b Egyptians and Babylonians IV Greek Astronomy V Pythagoras a Theory b Parallax VI Abandon theory if observation is wrong VII Plato a Theory VIII Retrogression retrograde motion IX Eudoxos a Theory Current Lecture I Humankind has always been in contact with surroundings a Senses gateways to knowledge of outside world i Outside World 1 Celestial sun moon stars a Regular predictable good you can count on it 2 Terrestrial trees mountains rivers animals a Close tamable knowable good but not as good as celestial 3 In between rain snow hurricane tornado a Always moving II Gods were created These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute a Priests were the first scientists i Priests predicted what would happen on the earth III Astronomy a Began as astrology not related now b Science is based on observation and theory but the Babylonians and Egyptians did not care about theory IV Greek Astronomy a Cornerstone of Greek knowledge astronomy b Secular Science c Based on observation that needed an explanation i Masters of theory making ii Observation starts theory explains it cannot contradict d Real science started with the Greeks V Pythagoras a All planets stars moon and earth move uniformly around a central fire not the sun on circular paths i Simplicity and symmetry guideline 1 Uniform motion simplest circle symmetric b Parallax change in the line of sight i Pythagoras could not detect earth s motion VI Abandon theory if observation is wrong VII Plato a Everything moves around earth earth center i Crystal clear spheres rotating uniformly around earth b Soon observed that planets do not move uniformly VIII Retrogression retrograde motion i Changes direction IX Eudoxos a Planet is attached to one uniformly rotating sphere attached to another uniformly rotating sphere etc i All spheres concentric with earth
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