# Essential Question How do you determine what time

Essential Question How do you determine what time it is based on a location? Activating Strategy Students will discuss with a partner why we see the Olympics at a different time then they do in London?

Teaching Strategies Summary Students will finish the statement, The reason we use time zones is.. Homework

Options Complete Time Zone worksheet/What Time Is It? 7.3.spi.17. read and interpret a time zone map. (Blooms Taxonomy level 6) Estimated Lesson Length: 1 day Show students the images of sunlight going across the globe. Discuss how this can affect the flow day, What would happen if every place on the earth was at 1:00 pm at the same time?

AP#1- Pair/Share: Each pair will come up with 2 answers to the following question, Why would it be important to be aware of the differences in time? Students will discuss how many degrees are in a sphere/circle and how many hours are in the day. Lead the students to realize that in order to equally divide up the day and the degrees on the globe we can determine divide the amount of degrees by days. 360/24= 15 Each time zone will be 15. Compare time zones to a number line. Moving to the right adds to the time and moving to the left decreases it. Graphic/Organizer: Time Zone Chart . AP#2 What time is it? Ask individual students to pick a time and place on the map. On their dry erase board, have them write down what time it is in one of the stared location.

Show students the maps where the lines are not straight. Have them brainstorm ideas about why the lines bend. AP#3 In groups, students will write a computation problem using time zones and share with the class. The class will solve their problem. Earth rotates west to east Solar time is based on the position of the sun NIGHT IS FALLING ON EARTH Look at the East Coast of the United

States. The lights are already lit. California the sun is still visible. This pictures shows AMERICAN CITIES at night. Saguenay Thunder Bay

Toronto Ottawa Its still daylight in California Sept-Iles St.John Qubec

Montral Detroit Those light are Boston, New York, Philadelphia and Washington. Dallas Houston

Mexico City Miami Havana Puerto Rico Port-au-Prince

NIGHT IS FALLING ON EARTH. Look at Paris and Barcelona, the lights are already lit, meanwhile in London, Lisbon and Madrid the sun is still visible. Looking south, we can see the islands in the middle of the ocean. We have a perfect view of the British Islands, Iceland and Canada.

Iceland England Atlantic France Ocean Spain

Italy AFRICA Imagine that it is 1:00 pm in New York, New York at the same time as Sydney, Australia. Pair/Share Come up with 2 answers to the following question,

Why would it be important to be aware of the differences in time between different locations? LONGITUDE AND TIME The world rotates (spins) _____ in ___ hours. How many degrees per hour does the earth spin? 360 / 24 hours = 15 per hour The world has 24 time zones, each l5 apart.

THERE IS A 1 HOUR TIME DIFFERENCE FOR EVERY 15 OF LONGITUDE Greenwich, England is the logical starting point for time zones The world rotates west to east (counterclockwise), time zones to the east are ahead of the those time zones to the west Think of it as a giant number line.

Greenwich, England is at 0 on the number line. As you move to the left you add, as you move to the right you subtract. -2 -1 Sandwich Islands

Dakar 0 +1 +2 Cape Town

Paris Greenwich Graphic Organizer What time is it in the locations below ANOTHER CHEESY SAYING EAST INCREASE

Time is forward to all places to the east WEST LESS Time is backward to all places to the west 4:00 PM If it is 4:00 PM in New York What time will it be in Iowa, Utah, and Oregon?

East Increase West Less (1 hr per l5) If it 9 p.m. at Position D, what time is it at position C? Position B? If it is 1 p.m. at Position X, at which location is the time 5 Graphic Organizer

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