Question

what is standard merridean line?
write its significance

Answer 1

Standard meridian line is a meridian which determines standard time for whole country .
Larger countries like Russia have several time zone .
In India the meridian 82.5° E is standard time for whole country which is 5 hr 30 min ahead of Greenwich Mean Time.
It is there so that there should be no confusion between the travellers .

Answer 2

Standard meridian line is a line which was introduced to make the time period of all country equal.
it's significance is
It shows the same time in all people whatches. In a particular country. in India's it is taken from mizapur madhya Pradesh.