The Earth is divided into 24 time zones. Standard time is the time used within time zones.
time zone, standard time, Greenwich, local time, International Date Line, UTC, Coordinated Universal Time, Earth, time difference, longitude, geography
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 centre 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.
Day - night
Due to the Earth´s tilted axis, the angle of the Sun's rays at given latitudes is continuously changing during the year.
Due to the Earth´s tilted axis, the angle of the Sun's rays at given latitudes continuously changes during the year.
The Earth is divided into geographical and climatic zones, which result in the zonation of vegetation.
The animation shows the forms of government and official languages of the world´s countries.
The geographic coordinate system enables every location on the Earth to be exactly specified.
The system of circles of latitude and longitude on the globe enable every location on the Earth to be exactly specified.
The first calendars and time-measuring instruments were already used by ancient Eastern civilisations.
The apparent movement of the Sun is caused by the Earth's rotation around its axis.
Place historical events on the time spiral.
Change of light conditions in different seasons. Measuring height using shadows.
A game to practise the use of analogue and digital clocks.