NATS 1745 Lecture Notes - Lecture 4: Philolaus, Heraclides Ponticus, Anaximander
4 Oct 2018
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Sirius/sopdet/sothis rising with the sun: navigation, agriculture. Before greeks: observed heavens, stars, moon, sun, planets, made predictions about new events, heliacal risings, eclipses, cosmology tied to mythology, gods were used for explanation, no rational explanation. Phases of moon, sun (solstice: ancient greek timeline: Lecture: ancient greek astronomy: c. 700-280 bce archaic period, c. 480-323 bce classical period, c. 323-156 bce hellenistic period, c. 156-30 bce greco-roman period. Incorrect: student of thales of miletus, created first model of universe. Sun, moon, stars were on wheels, orbited earth (they disappeared under the earth for a period of time and eventually returned. Lecture: ancient greek astronomy (2): shadow of earth on moon curved during lunar eclipse: philolaus (470-385 bce) Earth moved around celestial central fire once a day. Syene (upper egypt): sun is overhead at summer solstice, no shadows. Alexandria (north of syene): pole will cast shadow at noon on summer.
