PHY 102 1nd Edition Lecture 1Outline of Current Lecture I. Humankind has always been in contact with surroundingsA. Sensesa. Outside Worldi. Celestialii. Terrestrialiii. In-betweenII. Gods were createda. PriestsIII. Astronomya. How it beganb. Egyptians and BabyloniansIV. Greek AstronomyV. Pythagorasa. Theoryb. ParallaxVI. Abandon theory if observation is wrong!VII. Platoa. TheoryVIII. Retrogression/retrograde motionIX. Eudoxosa. TheoryCurrent LectureI. Humankind has always been in contact with surroundingsa. Senses = gateways to knowledge of outside worldi. Outside World1. Celestial = sun, moon, starsa. Regular, predictable, good (you can count on it)2. Terrestrial = trees, mountains, rivers, animalsa. Close (tamable), knowable (good, but not as good as celestial)3. In-between = rain, snow, hurricane, tornadoa. Always movingII. Gods were createdThese 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 scientistsi. Priests predicted what would happen on the earthIII. Astronomya. Began as astrology (not related now)b. Science is based on observation and theory, but the Babylonians and Egyptians did not care about theoryIV. Greek Astronomya. Cornerstone of Greek knowledge = astronomyb. Secular Science *c. Based on observation that needed an explanationi. Masters of theory makingii. Observation starts --> theory explains it (cannot contradict)d. Real science started with the GreeksV. Pythagorasa. All planets, stars, moon, and earth move uniformly around a central fire (not the sun) on circular pathsi. Simplicity and symmetry (guideline)1. Uniform motion = simplest, circle = symmetricb. Parallax = change in the line of sighti. Pythagoras could not detect earth’s motionVI. Abandon theory if observation is wrong!VII. Platoa. Everything moves around earth (earth = center)i. Crystal clear spheres rotating uniformly around earthb. Soon observed that planets do not move uniformly!VIII. Retrogression/retrograde motioni. Changes directionIX. Eudoxosa. Planet is attached to one uniformly rotating sphere, attached to another uniformly rotating sphere, etc.i. All spheres concentric with
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