Marine Science A100 Chapter 2: Marine_Science_A100_Chapter_2_
15 May 2020
School
Department
Course
Professor
Document Summary
Economic reasons: mobility , access to food supplies, find places to settle. Early opinions of earth: flat, dome, round (early greeks thought it was spherical) From records of trade in the mediterranean. First regular ocean traders: cretans or phoenicians, carried wares via straits of. Recorded info to make voyages easy and safe lilocation of rocks in harbor. Tech invented: compass, central rudder, water tight compartments, sophisticated sails, made fresh water. Reversed tribute system: instead of getting something, give something to someone. Eratosthenes: 1st to correctly calculate size and shape of earth & developed first systems of line of long and lad. Claudius ptolemy: improved the estimate of earth"s circumference(proved wrong: 70% of true size) Oriented charts, divided degrees into mins and secs. Christopher columbus believed it and used it to travel. Hipparchus: present grid, divided earth into 360 degrees. Henry the navigator, portugal(1460s): material goals, marine science discovery.
