CONS 127 Lecture Notes - Lecture 2: Arctic Circle, Antarctic Circle, Great Circle
23 Feb 2019
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Document Summary
Earth"s axial tilt: the earth spins at a 23. 44 degrees tilt, this helps give us seasons, when the top of the earth is tilted towards the sun, it is summer in the northern hemisphere. Since the southern hemisphere is tilted away from the sun, it"s winter there. London (greenwich) latitude: angle that describes the south-north position. Cons 127 lec 3: original measurement metrics were derived from the human body or common travel distances, hands, arms. Just late 2018 they redefined the kilo: until then it was a rock held at a paris museum, the 143 year old golf ball-sized metal cylinder was the global definition ofa kilo. It is now defined as the force generated by an electric current. It was the last "measure" that was defined "physically" Initially thomas jefferson rejected the metric system due to being too french. Conversion catastrophes: mars climate orbiter was supposed to be the first weather satellite observing other planet.
