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Time   Zones Subtitle Day and Night Time   Zones Subtitle Day and Night

Time Zones Subtitle Day and Night - PowerPoint Presentation

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Uploaded On 2018-12-17

Time Zones Subtitle Day and Night - PPT Presentation

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

zone time day zones time zone zones day rotation world night greenwich earth points civil rotates hours axis universal

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Presentation Transcript

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