Time zones
that the full rotation of the Earth around its axis takes 24 hours;
how to read the longitude from the map;
that the result of the rotational movement is day and night;
that each meridian has its own solar time.
explain what time zones are;
indicate the reasons for establishing universal time.
When the radio reports that it is 12:00, we know that you can hear the same message all over Poland. However, many residents could say that the sun is not at that moment at the highest point of its journey through the sky. Why is this happening? Why is there the same time in all of Poland when the Sun is towering on various meridians?
If every meridian on Earth would impose the use of their solar time on watch owners living on this meridian, most of them usually would show a different time, and if traveling from west to east or vice versa – one would have to move the watch. To avoid this, it was agreed to divide the entire area of our planet into 24 time zones corresponding to all hours throughout the day. Thus we have established time zonestime zones which have a latitude of 15° and extends 7.5° east and west of the meridian considered central for the zone. The central meridians were assumed to be the zero meridian, 180° meridian and all located between them, being a multiple of 15°, both in the western and eastern hemisphere.
All European countries are in five time zones. In the meridian zone of 0°, called the universal timeuniversal time or the time zone of Western Europe, there is, for example, the United Kingdom. Poland belongs to the Central European time zone assigned to the 15°E meridian. When in the universal time zone is 12:00, in the zone in which Poland is located (between 7.5°E to 22.5°E), it is 13:00.
The 0° meridian time is known as universal time. It is used in airplanes and ships around the world. This greatly facilitates communication between these modes of transport and traffic control centers.
Reasons for entering time zones. Complete.
24, 180 o sup>, western, 15 o sup>
The entire surface of the Earth was divided into .............................. time zones.
Each zone has a width of .............................. longitude.
The meridian of 0 ° was assumed to be the middle meridians, lying on the opposite side of the globe meridian .............................. and all the meridians between them, being a multiple of 15 ° both on the .............................. hemisphere , as well as the eastern hemisphere.
Indicate the time zones in which Poland is located.
- the Eastern European time zone
- the time zone of Western Europe
- Central European Time zone
- meridian zone 0°
- 180° meridian zone
- Moscow time zone
Using the time zone map, indicate the time according to the official time in Poland, when the time is 17:47 in London.
- 16:00
- 18:00
- 19:47
- 18:47
Summary
In order to unify the indications of watches in a given area, time zones have been introduced on the entire globe.
There are 24 time zones with a width of 15°.
Keywords
time zone, universal time, zone time
Glossary
czas strefowy – umowny czas obowiązujący w danej strefie czasowej wyznaczany zgodnie z czasem słonecznym odpowiednim dla południka będącego środkiem danej strefy
strefy czasowe – obszary powierzchni Ziemi o szerokości 15° długości geograficznej, rozciągające się po 7,5° na wschód i zachód od południka 0° i kolejnych południków położonych co 15° na obu półkulach; południki te stanowią środki stref czasowych
czas uniwersalny – czas słoneczny południka zerowego