Fill in the blanks with suitable answer:

The Indian Standard Time is based on ________ longitude.

The Indian Standard Time is based on 82 1/2 degree longitude.

Longitude is an imaginary line intersecting the equator at a right angle, joining both the north and the south. On the globe, one can see them as a series of semi-circles running from pole to pole, passing through the equator.

The relation between longitude and time – Longitudes (also called Meridians) are of equal length. The Meridian passing through Greenwich (England) is the Prime Meridian. Therefore, there are 180 longitudes to the East of Greenwich and 180 to the West, taking the total to 360 longitudes.