Official time
that the full rotation of the Earth around its axis lasts 24 hours;
how to read longitude on a map;
that the result of the rotational movement is day and night;
that each meridian has its own solar time.
explain the reasons for entering official time;
explain the reasons for the time change for summer and winter;
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 it’s 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 at different times?
Time zonesTime zones have not proved to be the perfect solution to all problems. State borders do not run according to the boundaries of zones. For example, if we strictly adhere to the boundaries of time zones, then part of Poland located east of the meridian 22°30'E should be included in the Eastern European time zone. So it would be an hour later than the rest of Poland.
In this situation, it makes no sense to introduce a different time for a smaller part of a given country and cause confusion associated with the need to change watches. A decision was therefore made to enter official timeofficial time, uniform throughout the country. Although the eastern borders of our country lie in the Eastern European time zone, they were officially included in the Central European time zone, which has a meridian 15°E spanning the western boundaries of Poland. The governments of many other countries did the same. Therefore, in many areas of the world there is a different time than it would result from their location in a given time zone.
In the eighteenth century, it was noted that in the summer you can get up an hour earlier to better adjust the time of activity to the period when the sun shines. In the twentieth century, summer time was introduced, during which the watches move one hour ahead of the current one in the given time zone. In Poland summer time is valid from the night between the last Saturday and Sunday of March to the night between the last Saturday and Sunday of October. For the rest of the year, the time appropriate for a given zone, called winter, applies.
Calculate which hour of solar time is on the meridian of 24 ° East when London (0 °) is 12:00. Then specify the time zone timezone time in this place.
Summary
There are 24 time zones with a width of 15 °.
In order for the clocks to show the same time all over the country, the official time valid throughout the whole country is introduced.
In many countries, summer and winter time are distinguished.
Keywords
time zone, universal time, official time
Match the pairs: English words with Polish definition.
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, umowny czas obowiązujący w danej strefie czasowej wyznaczany zgodnie z czasem słonecznym odpowiednim dla południka będącego środkiem danej strefy, umowny czas obowiązujący na danym obszarze, np. na terenie danego kraju lub części jego terytorium
| zone time | |
| official time | |
| time zones |
Glossary
czas strefowy – umowny czas obowiązujący w danej strefie czasowej wyznaczany zgodnie z czasem słonecznym odpowiednim dla południka będącego środkiem danej strefy
czas urzędowy – umowny czas obowiązujący na danym obszarze, np. na terenie danego kraju lub części jego terytorium
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