Time Zones

Hello, today I am going to write about time zones:

-YEAR: is a revolution around the sun. It takes 365 days and a half. Every 4 years there is one day more. It´s measured with calendar.
-DAY: is a rotation on it´s axis. It takes 24 hours and its divided into two 12 hours period. It´s measured with calendar too.
-A.M.: Ante meridiam (before the meridian).
-P.M.: Post meridiam (after the meridian)
-G.M.T.: Greenwich Mean Time
-U.T.: Universal Time.

Now I am going to answer some questions that my teacher have asked me:
 - How many Time Zones divide the earth?
   The Earth has 24 Time Zones. 
  -What is the distance (in degrees) between Time Zones?
 The distance between one Time Zone to the next is 15 seconds longitude.
 -What is the name of the city where  we can find the Prime Meridiam? What is its longitude?
Greenwich, England and it is at 0º longitude.

 The International Date Line (IDL) is an imaginary line on the surface of the Earth, that runs from the north to the south pole. If you want to cross the IDL from east to west it will take you 1 day (24 hours) and you wont be in the same day you will be one day after.
Here are some images of this unit:

 

This is a map showing Earth Time Zones.

This is a image showing the                                 This is the                              .    Prime Meridian.                                      International Date Line.