Question

D) Explain the terms.
1. Indian Standard Time:
2
t
2. Universal Standard Time:
E) Geographical explanation.
1. Longitudes lying to the east of any longitude are ahead of the time at that longitude while
those lying to the west are behind.
2. As the distance between two longitudes increase, their local times also starts differing.
3. If we multiply the difference between longitudes in degrees by 4 minutes, then the
difference in the respective local times can be calculated.
4. The difference in longitudes can be known with the help of a globe or a map.
Carry out the activity given on Page 75 and 76 and understand the standard time of various
locations. See ifyou can find out the standard time at two opposite longitudes with this activity.
Write your observation in the space provided.​

Answer 1

Answer:

Indian Standard time (IST) is the time zone observed throughout India, with a time offset of UTC+05:30. ... Indian Standard Time is calculated on the basis of 82.5°E longitude in the city of Mirzapur, Uttar Pradesh, which is situated approximately on the corresponding longitude reference line.

Explanation:

2. Universal Time (UT) is a time standard based on Earth's rotation. ... All of these versions of UT, except for UTC, are based on Earth's rotation relative to distant celestial objects (stars and quasars), but with a scaling factor and other adjustments to make them closer to solar time.