1. How many degrees does the Earth rotate in 24 hours?? 360°

2. How many hours are there in a day? 24? Really 23 hours and 56 minutes but let us pretend

3. How many degrees does the Earth rotate in 1 hour? 24 hours 360°

4. 15° per hour

5. Time Zones Lines of Longitude are also used to create all the time zones on Earth. Lines of Longitude are also used to create all the time zones on Earth. After 24 hours, the Earth has undergone 1 full rotation (360°). After 24 hours, the Earth has undergone 1 full rotation (360°). 360°/24 = 15 360°/24 = 15 Therefore, every 15° of longitude is a new time zone. Therefore, every 15° of longitude is a new time zone.

6. Time Zones Lines of Longitude are also used to create all the time zones on Earth. Lines of Longitude are also used to create all the time zones on Earth. After 24 hours, the Earth has undergone 1 full rotation (360°). After 24 hours, the Earth has undergone 1 full rotation (360°). 360°/24 = 15 360°/24 = 15 Therefore, every 15° of longitude is a new time zone. Therefore, every 15° of longitude is a new time zone.

9. Example (Not in notes) If you go 15° to the west, it is 1 hour earlier. If you go 15° to the west, it is 1 hour earlier. If it is 8 PM here, Chicago is about 15° west of us and so??If it is 8 PM here, Chicago is about 15° west of us and so?? it is 1 hour earlier there and it’s 7 PM there. Back to the future….

10. Example (Not in notes) If you go 15° to the east, it is 1 hour later. If you go 15° to the east, it is 1 hour later. If it’s 7 AM in California, we are about 45° east and so???If it’s 7 AM in California, we are about 45° east and so??? It is 3 hours later here and it’s 10 AM. 45 15

11. The International Date Line If every 15° west is one hour earlier, couldn’t we just keep going west until we travel back in time to yesterday?? If every 15° west is one hour earlier, couldn’t we just keep going west until we travel back in time to yesterday?? NO! The International Date Line prevents us from doing that. NO! The International Date Line prevents us from doing that.

12. Prime Meridian and Standard Time (III) The 180º meridian (opposite to the Prime Meridian) is called the International date line. The international date line is where a new day officially begins. Regions west of this line are one day ahead than areas east of the dateline

13. Daylight Savings Time In many countries time is set ahead 1 hour in the spring and set back 1 hour in the fall. The idea is to extend daylight for early evening activities.

14. I'm climbing the Ladder of Latitudes, latitudes, latitudes I'm climbing the ladder of latitudes, all around the world. (Longitude) It's a LONG LONG way from pole to pole, pole to pole, pole to pole It's a LONG LONG way from pole to pole, so we call those LONGITUDES. Latitude and Longitude Song The songs can be sung to the tune of "The Wheels on the Bus"