TIME ZONES R De Marco Marlboro Central HS

TIME ZONES R. De. Marco Marlboro Central HS

SUBTRACT HOURS TIME ZONES ON EARTH ADD HOURS Greenwich Meridian International Date Line ADD HOURS SUBTRACT HOURS 15° 15° 15° 15° 15° 15° 1 am 2 am 3 am 4 am 5 am 6 am 7 am 8 am 9 am 10 am 11 am NOON Midnight 11 am 1 pm 2 pm 3 pm 4 pm 5 pm 6 pm 7 pm 8 pm 9 pm 10 pm

Spin, Spin! • Quick Check: • If Earth rotates 15°/hour… How many degrees will Earth have rotated after 3 hours? 15° x 3 = 45°

• THESE LONGITUDE LINES ARE 15° APART. • If it is 2 pm in time zone A, what time is it in time zone B? 6 A 2 3 4 5 B 7

• If it is 9 pm at location X, what time is it at location Y? Y X

• If it is 11 am at location W, what time is it at location Z? W Z

• If it is 10 am at location R, what time is it at location T? R T

Note: Latitude does not effect time zones, although some time zones are not exactly aligned with longitude meridians, so you might encounter the edge of another time zone even if you were to travel north or south. Reason?

Note: Latitude does not effect time zones… Although some many time zones are not exactly aligned with longitude meridians, so you might encounter the edge of another time zone even if you were to travel north or south. Reason? You wouldn’t like it very much if your house and the school were in different time zones! Usually, the boundaries are shifted a bit to run through areas that don’t influence a large population.

The Regents Exam loves to ask questions about time zones with a different point of view… Like a bird flying over the North Pole. We call this a “Bird’s Eye View”

Looking down from the North Pole: DARKNESS

Looking down from the North Pole:

If it is 8 am at location X, what time is it at location Z? X Z

If it is 2 pm at location W, what time is it at location Y? Y Y W

Could you label this diagram with: NOON, MIDNIGHT, 6 am, 6 pm? Y Y W

• Real world applications: Penelope leaves Africa and returns to Florida after a delightful vacation. If she leaves at 7 pm local time in Africa, if the flight takes 8 hours, what will be the local time in Florida when she lands? If she leaves her wrist watch on local Africa time…what will her wrist watch show the time as when she lands in Florida? Can you make up a crazy question? Are you extremely confused?