2.Answer the questions.
1)It's 12 noon in Grenwich.
a) Is the sun rising or setting in New York?
b)Is it 9 o'clock in the morning or in the evening in Japan?
2)If you cross the International Date Line from west to east, do you go into yesterday or tomorrow?
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The Earth rotates on its axis.It takes 24 hours to turn.This means that the time isn the same in diffrent parts of the world.Unitil th 19th century, towns in the same country often had different times.This was because people told the time by the local position of the sun.It didn't matter because people didn't travel very much and they travelled very slowly.However, all that changed when railways arrived.People could now travel quickly from town to town, so they needed a standart time.In 1884, countries agreed to an international time system with 24 zones.The time zones start from The Prime Meridian at Greenwich in London.All places east of Greenwich are later;all places west of Greenwich are earlier.Most countries are in on time zone, but some large countries have more than one.There are five time zones in the USA (excluding Hawaii).So when it's 9 am in New York, it's only 6 am in Los Angeles.Australia has three time zones and Russia has eleven!.The system of time zones starts in Greenwich. On the other side of the world is the Internationa Date Line.When you cross this line, you don't just change hours, you change days. So you can travel from today back into yestarday!
1) a The sun is setting in New York.
b It's 9 o'clock in the evening in Japan.
2) When we cross the international Date Line we go into tomorrow.