That means that it is a different day on each side of the line. On one side of the line time is 12 hours behind Britain, and on the other side time is 12 hours ahead of Britain. On the opposite side of the world from London is the International Date Line.The world is split into time zones. Continental Europe is in the time zone to the east of Britain, so time is one hour ahead there when it is 1pm in Britain it is 2pm in France.The (imaginary) line between the Eastern and Western hemispheres is called the ‘Prime Meridian’ and it goes through Greenwich Royal Observatory in London.To help us understand where we are in the world, we also split the world into right and left halves called the Eastern hemisphere and the Western hemisphere.Imagine celebrating Christmas on a long, hot summer day!
In the Southern hemisphere the seasons are the other way around. When it is summer in Europe, it is winter in Australia.In London, the longest day is about 16 hours and 39 minutes and the shortest is 7 hours and 45 minutes. In summer the days are longer than they are in winter.In the Northern hemisphere, we have summer in June, July and August and winter is in December, January and February.The (imaginary) line between them is called the equator. We call the top half the Northern hemisphere and the bottom half the Southern hemisphere. At any moment, half of the world is in daytime and half is in nighttime.
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