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प्रश्न
Give a reason for the following :
When it is noon at Cairo (30°E), the local time in New York (75°W) is 5.00 a.m.
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उत्तर
| New York | Greenwich | Cairo |
| 75° W | 0° | 30°E |
| ? | 12.00 |
Longitude of Cairo = 30° E
Longitude of New York = 75° W
Difference in Longitude = 30° + 75° = 105°
(Add because Cairo is in the East of Greenwich and New York is in the West of Greenwich).
∴ Difference in time = 105 × 4 = 420 minutes = 7 hours
As New York is situated in the West of Greenwich, its local time will be behind that of Cairo. So we subtract.
| Hours | Minutes | |
| Local time at Cairo = | 12 | 0 |
| Subtract = | 7 | 00 |
| Local time at New York = | 5 | 00 (a.m.) |
संबंधित प्रश्न
Which line of longitude is used to fix the World Standard Time? State its value in degrees.
With reference to the International Date Line, state the following:
It is meaning and application.
Which meridian is called Prime meridian?
What is the rate of change of time per degree of longitude?
Why do some countries have many time zones?
OR
What are ‘Time Zones’?
Give a reason for the following :
The distance between two consecutive meridians is equal to about 111 kilometers only at the equator.
Clearly distinguish Longitude from Lines of Longitude.
What will be local time at Delhi 77° E longitude when it is 3 p.m. at Tokyo 139°E longitude?
A ship crossing international dateline at mid-night on Wednesday Eastwards, find that it is mid-night Tuesday on the American side. Why?
What are called meridians of longitude?
