GEOLOGY 103 Lecture Notes - Lecture 1: Pytheas, Dead Reckoning, Radio Navigation
25 Aug 2016
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Hypothesis: it is impossible to prove to you that the world is sphere, in science nothing can be proven, only disproven. No matter how many white swans you see there is no way to prove all swans are white. Theory: a lot of evidence that supports an idea (theory is not fact. Scientific theory: once a hypothesis has been tested time and time again it can be accepted as a theory. Calculating circumference of earth: using angle of sunlight before satellites. Knowing circumferences allows other dimensions can be calculated: diameter, radius, area, surface area. How to describe where are on planet: latitude (n&s) &longitude (e&w) Grid system: used to precisely describe locations. Based on angular relationships to earths center. 90 at poles 0 at equator for lat. Everywhere on earth surface: 1 lat= 60 nautical miles, 1" (min) lat = 1natical mile.
