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Time zones
The Earth is divided into 24 time zones. Standard time is the time used within time zones.
Geography
Keywords
time zone, standard time, Greenwich, local time, International Date Line, UTC, Coordinated Universal Time, Earth, time difference, longitude, geography
Related items
Scenes
The Earth
- Prime Meridian
- International Date Line
The Earth is divided into 24 time zones.
Time zones were defined by geometrically dividing the Earth`s equator into 24 sections bordered by meridians, each 15° of longitude apart (because the Earth rotates 15° in 1 hour). Hence adjacent time zones have a time difference of exactly 1 hour, one hour less on the west, one hour more on the east.
Standard time is the time used in time zones. The local time at the meridian in the center of each time zone is defined as the standard time.
By convention, the starting point of the time zones is the Greenwich time zone (the section between the longitudes 7.5° W and 7.5° E).
The international date line is an imaginary line connecting the North Pole and the South Pole, its path roughly follows the 180° meridian. When crossing it from east to west we advance the calendar date by one day, when we cross in the opposite direction the calendar date to the west of the line is repeated.
Standard time
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- Prime Meridian
- International Date Line
- Greenwich Mean Time
Time zone
- Prime Meridian
- International Date Line
Day - night
- morning
- noon
- afternoon
- midnight
- Prime Meridian
- International Date Line
Related items
Change of seasons (basic)
Due to the Earth´s tilted axis, the angle of the Sun's rays at given latitudes is continuously changing during the year.
Change of seasons (intermediate)
Due to the Earth´s tilted axis, the angle of the Sun's rays at given latitudes continuously changes during the year.
Climate zones
The Earth is divided into geographical and climatic zones, which result in the zonation of vegetation.
Forms of government and official state languages
The animation shows the forms of government and official languages of the world´s countries.
Geographic coordinate system
The geographic coordinate system enables every location on the Earth to be exactly specified.
Geographic coordinate system (basic)
The system of circles of latitude and longitude on the globe enable every location on the Earth to be exactly specified.
Measuring time
The first calendars and time-measuring instruments were already used by ancient Eastern civilizations.
The Sun's path above the major circles of latitude
The apparent movement of the Sun is caused by the Earth's rotation around its axis.
