GEO 110 Lecture Notes - Lecture 2: Coordinated Universal Time, Caesium, Winter Solstice
4 Feb 2020
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Document Summary
Global time kept according to adjacent standard meridians, normally differ by one hour. Based on the east-west position of the sun. Solar day defined by one sun circuit. Time zone boundaries often follow pre existing natural or political boundaries. International date line in an eastward direction, travelers seet their calendars back one day. Dashed lines represent 15 meridians and bold lines represent 7. 5 meridians. Opposite side of globe or 180 (190th meridian) Earth rotates 15 per hour, time zones differ by 1 hour (360 /15 = 24 hours) Clocks are set ahead an hour (or two) for part of the year to correspond with the pace of modern society. United states- daylight saving time begins the second sunday in march, discontinued first the sunday of november. Not all of the us observes dst. European union daylight saving=summer time begins on last sunday in march, ends on the last sunday in october.
