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प्रश्न
Explain how the longitude of a place affects the time.
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उत्तर
As the Earth rotates from west to east about its own axis, the zone of illumination moves slowly towards the west. This accounts for variation in the time of Sunrise and Sunset at different places on the Earth. The Earth takes 24 hours to complete one rotation. This means that 360 degrees of longitude are covered in a period of 24 hours. This gives rise to a time difference of [24 × 60/360] or 4 minutes for 1° of longitude. The time difference is to be added in case of places to the east of a point. In the case of places to the west, the time difference is to be subtracted. It is possible to calculate the time at a given place A from the time recorded at B and the longitude difference between stations A and B.
संबंधित प्रश्न
An important programme was to be broadcast from Mumbai at 7.30 p.m. This was heard by some Indian sailors near Ivory Coast in West Africa at 20°W longitude. What was the local time there?
What is the longitude of a place where the local time 1:15 p.m. when it is 4 a.m. at Chicago (88°W)?
Name the two hemispheres of the Earth made by the equator?
Why do some countries have many time zones?
OR
What are ‘Time Zones’?
Give a reason for the following :
All parallel other than equator are not Great Circles.
Give a reason for the following :
A person, travelling from Mumbai to London, alters the time on his watch at several places.
State two properties of lines of longitude.
When it is 7.30 pm on August 16 in Greenwich, it is ______ (time) on ______ (date) in Chennai.
How are the hemispheres divided on the basis of lines of latitude and longitude? Explain with diagrams.
What are Western Longitudes?
