World time zones
Time was invented by people so it is easier to identify it. Whether it’s a day or a night depends on the rotation of the Earth in the sense of a particular position of the given part of the Earth towards the sun. We invented time zones to make a better use of time in economic terms, and because time zones correspond to our biological nature.
What are time zones and why we need them
Whilst flying around the world I’ve noticed that people rarely know what time it will be when they get to their destination. When travellers are on the other side of the world they are not sure about the actual time difference and whether it’s the right time to call home and not to wake up parents in the middle of the night. That’s why I’ve attached the map showing time zones of the world. As time “0” I have shown the Greenwich Mean Time (GMT) where the world famous Observatory was founded in 1675 by Charles II. Nevertheless, time zones were invented in 1879 by a Scottish born Canadian Sir Sanford Fleming. Please note the colours on the map and its explanation underneath which show the time differences as we move west or east from Greenwich and note that the standard time zones move by full hours GMT+ and GMT-.
I also want to remind what “time” is. Time was invented by people so it is easier to identify it. Whether it’s a day or a night depends on the rotation of the Earth in the sense of a particular position of the given part of the Earth towards the sun. We invented time zones to make a better use of time in economic terms, because if the entire planet was on the same time the world would not be able to produce enough energy, hence the DST (Daylight Saving Time). Time zones also correspond to our biological nature because we are diurnal animals and they depend on the rotation of the Earth which the total turn around takes 24 hours. That’s why we have 24 hours in a day and 24 main time zones as shown on the map below. Apart from that there is 360 degrees in a circle and that’s why there is also 360 degrees around the planet.
Non-standard time zones GMT+15min and GMT+30min
- For example India is in the middle of two meridians and that’s why over there the time has been put forward by 30 minutes. For this reason India operates not on GMT +5h or 6h but GMT+5h.30min. India argues that such move was necessary to make a better use of time because in such a big country it wouldn’t be economically sensible to keep western Amritsar and eastern Calcutta on one time. Therefore by giving up on one of the two time zones the other option was to divide them in half.
I still think that it would be better if India worked on GMT+5h because it would be economically beneficial and it wouldn’t introduce chaos into time zones.
- The interesting thing also happens between India, Nepal and Sri Lanka because they are all located near the same meridian but Nepal retains the time difference of 15min ahead of India, while Sri Lanka still operates on the Indian time. So why does Nepal work on time GMT+5h.45min? The Convention of Time Zones dictates that the standard meridian of the country must be a multiple of 7.5 degrees, so there could be a difference in multiples of 30 minutes (7.5 degree x 4 = 30 minutes) between time zones. It is therefore apparent that Nepal should work on the Indian time GMT+5.5h but Nepal was the exception in the Convention which took place in 1956. It’s because meridian which lies on 82.5 degrees divides Nepal into two very unequal parts, and that’s why it was decided that the Nepal’s meridian should the peak of Gauri Shankar (86 ° 20 ‘E) which lies only 100km east of Kathmandu. Because it is not a multiple of 7.5 degrees the most approximate time zone of Nepal is GMT+5h.45min.
I think that Nepal occupies itself with artificial problems because due to its location on the eastern part of the Indian Subcontinent it should run on GMT+ 6h instead of enjoying “15 minutes of fame.”
There are a few more examples of this type. Half an hour time differences are for example Iran, Sri Lanka, Afghanistan and Newfoundland in Canada – but only in summer. Some countries such as for example Egypt changed its time 4 times in 2014 and it will change its time 4 times in 2016 as well, using saving energy as the official excuse. Very strange things also happen in Russia because the president of that great country changes time zones at his own discretion. Russia used to have 9 time zones and now it already has 11 so that two regions could be on a year-round summer time.
The countries with several time zones
Many time zones have huge countries so those which are cut by more than one meridian. These include: Russia, Canada, Brazil, Australia, Indonesia, USA Mexico and a few more.
Many time zones have also postcolonial European countries which have their overseas territories around the world, such as: France, the UK or Denmark.
Regions without time zones
South Pole (Antarctica) and the North Pole are covered by all time zones at the same time because all the ends of all the meridians meet in one place. This means that continents which have 24h sunlight during summers and 24h night during winters don’t have time zones because it simply doesn’t make sense.
Countries with time zones GMT+13 and GMT+14
As I wrote above one day has 24 hours and that’s why there are 12 time zones on both sides of Greenwich Mean Time. How how is it possible that there are times zones GMT+13 and GMT+14? Well, the International Date Line which runs between GMT+12 and GMT-12 along the meridian of 180° is the line of date change what means that during crossing from east to west one day is added. Prior to 1995 the International Date Line crossed the island nation of Kiribati, what meant that eastern Kiribati was one day and 2h behind western Kiribati, where the capital was. For that reason in 1995 Kiribati decided to move the International Date Line east so the whole country could fit into one day. Because of that Kiribati and Hawaii which are located along the same meridian are divided by a time difference of one day. Prior to 1995 GMT+13 and GMT+14 did not exist.
Kiribati is therefore a special place because this island nation consisting of 33 atolls has 3 time zones and finally fits in one day.
Gilbert Island (main town Tarawa) GMT+12
Phoenix Island (main town Rawaki) GMT+13
Line Islands – sometimes also called the Christmas Island (main town Kiritimati) GMT+14. This means that people living on the island of Kiritimati are first to see the new day and the first to celebrate the New Year. For a comparison, 1st of January in London will be 14h later than 1st of January on Kiritimati (Christmas Island).
Tokelau – dependent territory of New Zealand and Tonga also operate on time GMT+13.
Samoa – on the 29th of December 2011 the island nation went from GMT-11 to its standard time zone GMT+13 and its daylight saving time (DST) GMT+14. For Samoa the time change was necessary because at the end of 2011 that small country was 21h behind Australia and 21h behind New Zealand, which are its main trade partners. Due to differences in time before the date change Samoa had only three full working days.