LONGITUDE (to measure East-West), is all a matter of time…

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Presentation transcript:

LONGITUDE (to measure East-West), is all a matter of time…

15° 30° 45° LONGITUDE (to measure East-West), is all a matter of time… TIME ON BLUE MERIDIAN: 1400 1200 1500 1300 OVERHEAD SUNLIGHT 15° 30° 45°

WEST Morning Noon Afternoon EAST 15° LONGITUDE (to measure East-West), is all a matter of time… WEST EAST Morning OVERHEAD SUNLIGHT 15° Noon Afternoon

PRIME MERIDIAN 0° 120° 15° TIME ZONES

Time at 0° Longitude is called Greenwich Mean Time, Universal Time Coordinated (UTC), ZULU time, etc.

Monday afternoon and night 15 30 -15 45 60 75 90 -30 -45 -60 -75 -90 -105 -120 -135 -150 -165 165 150 135 120 105 180 It is now 1400 along the prime meridian. If it is Monday in London, what day is it at other locations around the world? As the earth rotates 15° the local time on the meridians advances one hour The local time in each time zone: 1200 along the 0° meridian There must be a meridian where the day changes. It is the 180° meridian along which is plotted the International Date Line. 0600 0700 0800 0900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200 2300 0000 0100 0200 0300 0400 0500 The day changes at midnight, 0000, right? Monday Tuesday MONDAY TUESDAY Tuesday continues around the world MERIDIANS TUESDAY WEST NOON SUNLIGHT Monday Tuesday Prime Meridian International Date Line EAST MONDAY MONDAY Monday afternoon and night Monday here Two different days at the same place???