Question

How longitudes help us to calculate time .

Answer 1

Every gain or loss of 1° longitude stands for 4 minutes.

360°= 24 hours = 1440 min

360° implies one complete rotation of earth.

1° = 1440 min ÷ 360° = 4 min

now,

on every longitudinal degree increase towards east of prime meridean(i.e 0°), add 4 min and

on every longitudinal degree increase towards west, substract 4 min.After the hours is calculated add(if east) or substract( if west) it with time of GMT. example is mentioned below.

prime meridean is our world’s relative standard time calculator.Also known as GMT, Greenwich meridean time.

example.

mirzapur of india is at 82.5° East from prime meridean(GMT).

To calculate time

multiply 82.5 with 4 i.e 330 minutes.divide 330 min with 60 min i.e 5.5 hours.whatever time would be in greenwich,U.K, add 5.5 hours with that.

simple!

longitude passing through Mirzapur is India’s STD (standard time zone).

same has to done in case if the position is on west of GMT but in this case time has to be substracted from time of GREENWICH.

hope,this would be helpful.

Answer 2

Longitudes are geographical positioning markers that run from the geographical North to the geographical South Pole, intersecting the Equator. They meet at both Poles, and specify the East-West position of a location.

Longitudes are therefore imaginary circles that intersect the North and South Poles, and the Equator. Half of a longitudinal circle is known as a Meridian. Meridians are perpendicular to every latitude.

Unlike, latitudes, there is no obvious central longitude. However, in order to measure the position of a location based on the longitude, cartographers and geographers over the course of history have designated different locations as the main longitudinal reference point. Today, the meridian line through Greenwich, England is considered as the reference point for longitudes. This line is also known as the Prime Meridian

The Prime Meridian is set as 0° longitude and it divides the Earth into the Eastern and the Western Hemisphere. All the other longitudes are measured, and named after the angle they make with respect to the center of the Earth from the intersection of the Meridian and the equator.