Question

draw the meridians at an interval of 30 degrees on a world map and calculate the time of those meridians when it is 12 noon at Greenwich

Answer 1

1 degree is equal to 4 minutes.

Therefore, if we are calculating time west of Greenwich then we need to subtract the calculated time from GMT. If it is on east then we need to add it.

Therefore, 30 degrees east and west of Greenwich,

30x4=120 minutes= 2 hours

For 30 degrees East of Greenwich we will add, 12pm +2 = 2 pm

For 30 degrees West of Greenwich we will subtract, 12pm-2= 10am