Longitude and Time Zones (2020)

Longitude and Time Zones (2020)

Prime Meridian

• 0° longitude

• Greenwich, England

• Starting point for all lines of longitude

• Everything is measured in distance (degrees) East or West of here

• West = one hour less

• East = one hour ahead

The International Date Line (IDL)

• Imaginary line through Pacific Ocean at 180 $\degree$  longitude (opposite Prime Meridian)

• Each new day begins here

• New Year's Eve

Jagged Time Zones

• follow national boundaries

• consistent date/time for regions

Who Decides?

• Time Zones are determined by each country.

• Some countries don't fit with the standard hourly time zones

• Examples include China, Iran, India, North Korea

Multiple Choice

Where does each new day begin?

• the Prime Meridian

• the Equator

• Greenwich, England

• the International Date Line

Multiple Select

Which of the following statements are true? Check ALL that apply.

• The Prime Meridian is opposite the International Date Line

• The International Date Line is located at 180° longitude.

• Countries can determine what time zone they are in or determine their own time zone.

• All areas are divided into time zones by a straight line of longitude.

U.S. Time Zones

• west = one hour less or "west is less"

• east = one hour ahead

• each time you move to a new time zone it is a one hour difference

• If it is 9 am in the Eastern time zone, it is 8 am in the Central time zone (one hour west/less)

Multiple Choice

When it is 8 am in Austin, Texas, what is the local time in Chicago, Illinois?

• 7 am

• 8 am

• 9 am

• None of these

Multiple Choice

When it is 6 am in Seattle, Washington, what is the local time in Denver, Colorado?

• 7 am

• 8 am

• 9 am

• None of these

Multiple Choice

When it is 11 am in Seattle, Washington, what is the local time in Atlanta, Georgia?

• 12 pm

• 1 pm

• 2 am

• 2 pm

• None of these

Multiple Choice

When it is 2 pm in Great Neck, NY, what is the local time in Anchorage, Alaska?

• 10 am

• 10 pm

• 11 am

• 11 pm

• None of these

Flight Travel

• Imagine a six hour flight from New York --> California

• It leaves New York at 6 am.

• What time will it be when you land in California?

Flight Travel

• Imagine a two hour flight from Minneapolis--> Boston

• It leaves Minneapolis at 11 am.

• What time will it be when you land in Boston?

Flight Travel

• Imagine a six hour flight from Seattle --> New York

• It leaves Seattle at 9 pm.

• What time will it be when you land in New York?

Open Ended

Imagine a five hour flight from Miami to Denver. It leaves Miami at 6 pm. What time will it ben when you land in Denver? Explain your reasoning.

Open Ended

Ask me anything about time zones and travel across time zones.

Poll

How is your understanding of time zones and travel across time zones?

• 5

• 4

• 3

• 2

• 1