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A time zone is a geographical region where almost everyone observes the same standard time.

Before clocks were first invented, it was common practice to mark the time of day with apparent solar time

1764 English horologist discovered a clock

1884 international officials agreed to divide the map into horizontal time zones.

1895 pacific time zones began

Time zones did not become mandatory since congress made act of 1918

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www.timeanddate.com
wikipedia.org
History.com

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What changed about timezones was that back then they would use different methods to keep track of time for example they would do it based on "high noon".

Most Americans and Canadians quickly embraced their new time zones since railroads were their lifeblood.

Not till 1918 congress adopted railroad time zones.

Small cities have one time zone while larger cities have multiple time zones

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The earth has 24 time zones because it takes the earth 24 hours to revolve around the sun

Each time zone is one hour apart

Every place within a time zone has the same time, referred to as its standard time

Rail roads instituted standard time in time zones.

North korea adopted a new time zone on Aug. 15. 2015.

Russia has 11 time zones since 2010

China is a large city that only has one time zone

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A congressional act transferred the ICC’s responsibilities on time zone boundaries to the US Department of Transportation in 1967. Today, the United States and its territories observe standard time within nine time zones.

Before clocks were first invented, it was common practice to mark the time of day with apparent solar time (also called "true" solar time) – for example, the time on a sundial– which was typically different for every settlement.

Russia has the most time zones.

3 Time zones can happen at the same time.

Australia has both horizontal and vertical time zones in summer.

The calculation of time zones are based on the fact that the earth rotates 15 degrees of longitude every hour.

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Michelle Arcos
Olivi Romero
Cesar Vicente
Per.5
April 14, 2016