Longitude and Time Relation
Longitude and Time Relation
Longitude and Time:
In the 1800s, each place had its own time.The length of the shadow cast by an object indicated the time. The shadow was shortest at noon, and longest at sunrise and sunset. At each place, whenever the sun was directly overhead, it was considered to be noon. This was called solar time or local time, and it was defined by the position of the Sun. The solar day was the time it took for the Sun to return to the same point in the sky.
Thus local time can be reckoned by the shadow cast by the sun, which is the shortest at noon and longest at sunrise and sunset.
In general when the Prime Meridian of Greenwich has the sun at the highest point in the sky all the places along their meridian will have mid day or noon. As the earth rotates from west to east those places east of Greenwich will be ahead of Greenwich Time and those to the west will be behind it.
As the Earth rotates, the Sun shines directly over each meridian once every day. Thus, the Sun rises in Delhi before it does in London. It is night in London when it is sunrise in Delhi. Similarly, when the Sun rises in London, it is still night in New York, which lies to the west of London.
The tropic of __________ passes through the central part of India. | |||
| Right Option : A | |||
| View Explanation | |||
Which of the following latitudes passes through India? | |||
| Right Option : D | |||
| View Explanation | |||
What name is given to 180° longitude due to the spherical shape of the earth ? | |||
| Right Option : C | |||
| View Explanation | |||
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