Calculating Time using Lines of Longitude

To calculate the difference in time between two places you need to know:

• That there are 15 degrees in an hour

• The difference in the degrees of longitude between the two places

• What time it is at the initial location

• All of the above

When it is Noon (12pm) in London (0° Longitude), what time is it in New York at approximately 75°W?.

• 7:00 a.m.

• 7:00 p.m.

• 6:00 a.m.

• 6:00 p.m.

When it is Noon (12pm) in London, it is 10pm in Sydney, Australia. Dan in London rings his friend Boski in Sydney at 15.30pm on Christmas Day. What time is it in Sydney?

• 1:30 a.m. December 24th

• 1:30 a.m. December 25th

• 1:30 a.m. December 26th

• 13:30 hours December 26th

San Francisco is approximately 120° west of London. An observer in London sees a clock at 15.30. How long will it be before a clock in San Francisco displays the same time?

• 10 hours

• 24 hours

• 12 hours

• 8 hours

f it is 12 noon at 15 degrees west longitude, what time is it at the prime meridian?

• 1:00 p.m.

• 1:00 a.m.

• 12:00 p.m.

• 11:00 a.m.

You are traveling east from Japan to San Diego. As you are just about to fly across the International Dateline (IDL), it is 8 AM on Wednesday. What time is it right after you cross the IDL?

• 8:00 p.m. on Wednesday

• 12:00 p.m. on Wednesday

• 8:00 a.m. on Thursday

• 8:00 a.m. on Tuesday

If it is 4 PM at 105 degrees east longitude, what time is it at 60 degrees east longitude?

• 7:00 p.m

• 12:00 noon

• 1:00 p.m.

• 3:00 pm.

When a person travels eastwards across the International Date Line he/she______

• crosses into another climatic zone

• puts his watch forward

• puts his watch backward

• does not change the time on his or her watch