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Time Zones

The Earth takes 24 hours to rotateonce on its axis. (This makes a day). It rotates 360°in a 24 hour period, so the Earth rotates at a rate of about 15°per hour. Therefore, the Earth has been divided into 24 time zones. For centuries people figured the time of day by the sun͛s position in the sky. Each day the sun rises on the eastern horizon, moves across the sky and sets in the west. Noon is the when the sun is at the highest point in its arc across the sky. (But it is NOT noon at the same time all oǀer the world, because of Earth͛s rotation).

The sun moves westward about 15°each hour, or

about 1°every four minutes. (So, New York City is at 74°W and Philadelphia is at 75°W, so noon in

New York City occurs about 4 minutes before it

does in Philly.

Time Zones are a geophysical world globe division

of 15oeach, starting at Greenwich, England, created to help people know what time it is now in another part of the world (see page 76 in your text for a good Time Zone tool).

These lines on a globe are called:

Time Meridians.

International Date Line

0 degrees Longitude

0 -1+1 -11 +10

The starting point for the standard time

zones is the Prime Meridian, 0°(which passes through Greenwich, England)

If you move westward from Greenwich (back

towards US) then you move your clock back to earlier time, while if you move eastward from Greenwich (further into Europe) you would set your clock to a later time. Ex.) If its 10am in Greenwich (at 0°), then it is

11am in Rome (at 15°E).

Is Point C 2 hours ahead or behind A?

So if its 7:00 at Point A, what time is

it at Point B? A B C

In theory each time zone should be exactly 15°

wide, but time zones are adjustedto prevent cities and certain areas from being split into 2 time zones. (That͛s why you see the time zone lines look a little jagged).

When going completely around the world you

will gain or lose time at each time zone until you have gainedor lostan entire day.

The International Date Line is the imaginary

line (at 180°) at which the date changes. If you move west (to the left) across the IDL, you gaina day, if you move east (to the right) across the IDL it is one day earlier. I N T E R N A T I O N A l D A T E L I N e I N Tquotesdbs_dbs2.pdfusesText_2