Question

What do you mean by IST ? why do we need a standard meridian ?

Answer 1

Answer:

is means Indian standard time ,each country has it's own standard time the will be different for each country according to it's longitudes and latitudes so to avoid confusion we use standard meridian or time

Answer 2

IST means Indian Standard Time.

We need a standard meridian because:

1. It helps to avoid a lot of confusion which would have been there due to different local times.

2. India is a large country over 30 degrees passes form Gujrat to Arunachal Pradesh. This helps to maintain a standard Time for them