it's third time plese answer of all of the questions
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4-the time calculated in the world wide is based on the greenwhich line and hence this line is also called prime meridian. The time in the world wide is calculated on the basis of the time in this line. According to this the world has been divided into 24 zones each with the longitudinal difference 1°
1.The North Pole and the South Pole serve as the reference points on Earth.
2.The North frigid zone, between the Arctic Circle 66.5° N and the North Pole 90° N. Covers 4.12% of Earth's surface. The North temperate zone, between the Tropic of Cancer 23.5° N and the Arctic Circle 66.5° N. Covers 25.99% of Earth's surface.
3.The torrid zone receives the maximum amount of heat throughout the year because the rays of the sun fall vertically on this region. This is located between the tropic of Cancer and Tropic of Capricorn in 23 1/2N to 23 1/2 S.
4.Significance of Greenwich mean time
The ‘Greenwich Mean Time’ (GMT) is the time that can be measured by the help of “Earth’s zero degree” line of longitude, or meridian.
This line called the Greenwich Meridian runs from the ‘North Pole’ to the ‘South Pole’ and passes through the ‘Old Royal Observatory’ in Greenwich, London.
Keeping this line as the marker, the terrestrial longitudes are marked and measured and the world’s various time zones are calculated.
If a country lies west to the meridian, then the time will be behind and will lose from the GMT.
If a country lies east to the meridian, then it will be ahead of GMT and will gain time.
5. Because 15 degrees of longitude is equivalent to 1 hour in time (that is 360 / 24) it is convenient to adopt time zones at 7.5 degrees or 15 degrees multiples. In other words time zones are separated by multiples of 1 hour or 1/2 hour.