PHYS 121 Chapter Notes - Chapter 1: Law (Principle), Dailymotion, Scientific Method
6 Oct 2017
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Eratosthenes of cyrene aka beta - greek mathematician astronomy. Wrote treat earth as a globe divided by latitude and into frigid, temperate, and torrid zones. How eratosthenes measured the size of earth. Measured shadows casted by a vertical pillar. Calculated earth"s circumference to be 250,000 stadia. In modern time, earth"s circumference is 40,000 km. Measured by aristarchus daily motion of the stars. Suggested that earth spins on its axis once a day which accounted for the. Calculated the moon"s diameter and its distance from earth. Compared the size of the moon with the size of earth by. Calculated the moon"s diameter to to be 1/ 3. 5 that of earth"s watching an eclipse of the moon. The sun"s diameter is 1/110 its distance from earth diameter/sun-earth distance. Principles and procedures for the systematic pursuit of knowledge involving the recognition and formulation of a problem, the collection of data through observation and experiment, and the formulation and testing of hypotheses.
