Question

Indian Standard Time is ahead of Greenwich Mean Time by _______.
1. 6 hours
2. 5 hours 30 minutes
3. 4 hours 30 minutes
4. 3 hours 30 minutes

Answer 1

Correct Answer - Option 2 : 5 hours 30 minutes

The correct answer is 5 hours 30 minutes.

• Indian Standard Time (IST) is 5 hours 30 minutes ahead of Greenwich Mean Time (GMT).

• In India, the longitude of 82.5^° E is treated as the Standard Meridian. The local time at the meridian is taken as the Standard Time for the whole country. It is known as the Indian Standard Time (IST).
• The Prime Meridian is a 0^° and is known as the Greenwich line as it passes through Greenwich near London, where the British Royal Observatory is located.
• Longitudes have one very important function i.e. they determine Local Time in relation to Greenwich Mean Time (GMT).
• Local Time is the time reckoned by the noon-sun at a given place and Standard Time is the Local Time of the Standard Meridian of a country.

Comparison between Latitude and Longitude
Latitude	Longitude
Latitude is the angular distance of a point north or south of the equator as measured in degree.	Longitude is the angular distance along the equator measured in degree.
All latitudes are parallel to the equator.	All meridians of longitude converge at the poles.
The distance between the two latitudes is approximately 111 km.	The distance between two longitudes is maximum at the equator (111.3 km) and minimum at the poles (0 km).
The 0° latitudes are referred to as the equator and the 90° is the poles.	There are 360° of longitude, 180° each in the east and west of the Prime Meridian.