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Longitude | Understanding Time Zones Video Lecture | Crash Course for Class 6
FAQs on Longitude - Understanding Time Zones Video Lecture - Crash Course for Class 6
| 1. What is longitude and how does it affect time zones? |  |
Ans. Longitude is the measure of distance east or west of the Prime Meridian, which is located at 0 degrees longitude. It is expressed in degrees, with lines of longitude running from the North Pole to the South Pole. Time zones are determined by longitude because the Earth is divided into 24 time zones, each generally covering 15 degrees of longitude. As the Earth rotates, different areas experience sunlight and darkness, leading to different local times.
| 2. Why do we have different time zones around the world? | |
Ans. Different time zones exist to accommodate the Earth's rotation and the position of the sun in the sky. As the Earth rotates, different parts of the world experience daylight and nighttime at different times. To standardize time and make it easier for people to coordinate activities, the world is divided into time zones, each generally one hour apart.
| 3. How do I calculate the time difference between two locations? | |
Ans. To calculate the time difference between two locations, first determine their longitudes. Each hour difference corresponds to 15 degrees of longitude (since the Earth rotates 360 degrees in 24 hours). Subtract the longitude of one location from the other to find the difference in degrees, then divide that number by 15 to get the time difference in hours. Adjust for any local variations such as Daylight Saving Time if applicable.
| 4. What is Daylight Saving Time and how does it relate to time zones? | |
Ans. Daylight Saving Time (DST) is the practice of setting the clock forward by one hour during the warmer months to extend evening daylight. This usually occurs in spring and ends in fall. Not all countries observe DST, and those that do may start and end it on different dates. This can create variations in time differences between locations during the DST period, making it important to check local times when planning travel or communication.
| 5. How did time zones originate and who decided on them? | |
Ans. Time zones originated in the 19th century as a response to the expansion of the railway systems and the need for standardized timekeeping. Before time zones, cities set their own local times based on the sun. Sir Sandford Fleming proposed dividing the world into 24 time zones at the International Meridian Conference in 1884, where the Prime Meridian was established at Greenwich, England. This standardization helped to facilitate travel and communication across regions and countries.
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