Rotation Rotation is one complete turn around the Earths axis Rotation causes day and night Rotation The earth rotates at a speed of 1000 miles per hour It rotates from west to east Earths rotational axis points in the same direction relative to the stars so that the North Pole points ID: 742882
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Slide1
Time Zones
SubtitleSlide2
Day and Night
Rotation:
Rotation: is one complete turn around the Earth’s axis
Rotation causes day and nightSlide3
Rotation
The earth rotates at a speed of 1000 miles per hour
It rotates from west to east
Earth's rotational axis points in the same direction relative to the stars, so that the North Pole points towards the star PolarisSlide4
What is a time zone?
Time Zone
Areas sharing the same time
There are 24 time zones in the world (same number of hours in a day)
Why do we have time zones?
We have time zones so that appropriate times correspond with daylight and night
For example, if we only had 1 time zone in the world it would be dark during the day hours for half of the world
https://www.timeanddate.com/time/map/Slide5
Universal Time
Greenwich Mean Time
Greenwich Mean Time: originally used as the international civil time standard
Coordinated Universal Time
The basis for civil time used today
Developed in 1967
Last modifications were made in 1972, when scientists accounted for leap secondsSlide6
Greenwich Time ZoneSlide7
Time Zones in the United States
Alaskan Time Zone
Hawaiian Time Zone
Mountain Time Zone
Pacific Time Zone
Central Time Zone
Eastern Time Zone