Chapter 7 International Date Line
- What is the time difference between the GMT and the IST? IST is 5hrs and 30 min ahead of GMT. 2
- Which meridian determines Indian Standard Time (1ST)? 82°30′ E is the standard meridian of India. 2
- Which meridian is used to determine world standard Time (GMT)? World Standard Time (GMT) is determined using Prime Meridian at 0° longitude. 1
- Using an atlas, tell in which of the following routes the IDL will be crossed and show them on the map. (1) Mumbai – London – New York – Los Angeles – Tokyo – IDL will be crossed. (2) Delhi – Kolkata – Singapore – Melbourne – IDL will not be cr... 1
- Why is the IDL considered with respect to the 1800 meridian only? Our 24-hour day starts at 12 midnight. Because of the earth’s rotation, the midnight occurs at different times, at different places. As the... 1
- Why doesn’t the IDL pass through land? If the IDL had passed through a land or some islands, the people there would have had to follow different dates and timings because dates wo... 1
- Why is the IDL not a straight line like the 1800 meridian? Attempt has been made to make the IDL pass through the Pacific Ocean completely. Had it passed through a land or some islands, the people th... 1
- While crossing the IDL, what changes will you make? When you cross the 180° meridian, some precautions need to be taken. There is a difference of 12 hours from Prime Meridian, if you go from E... 1
- What considerations have been made while deciding the IDL? The following points were taken into consideration while drawing the International Date Line. (IDL): 1. The direction of travel 2. The curre... 2
- The day starts in the Pacific Ocean on the earth The IDL passes through the Pacific Ocean. With reference to the IDL, the day on Earth starts in the West and ends in the East. It is one and... 1
- IDL is proving to be very useful in today’s times IDL is proving to be very useful in today’s times because: The IDL brings coordination between international airlines, transportation servic... 1