Question

The time difference between two consecutive longitude is _______ ?
A. 4 minutes
B. 2 minutes
C. 6 minutes
D. 10 minutes

Answer 1

Hint:
The main meridian line is assumed to be 0° longitude. It passes through Greenwich, London. There are longitudinal lines up to 180 ° on either side of 0°which are 360​​° in total. While only the 0° latitude line divides the earth into two equal parts, all longitudinal lines do this work. That is why all these are called the great circle. The distance at the equator of 1° longitude is 111.32 km. Which decreases towards the poles. All longitudes up to 180° east of Greenwich Line are called 'Eastern Longitude' and all longitudes westward are called 'Western Longitude'. These are called the Eastern Golard and the Western shell respectively. Being circular, the Earth rotates 360° in 24 hours, so it takes 4 minutes for the Earth to cover a distance of 1° longitude.

Complete answer:
The angular distance, measured from the center of the earth, to any point on a meridian north or south of the equator or equator on the terrain is called latitude. It is represented in degrees, minutes and seconds. The equator is a latitude of 0 °. It divides the earth into two equal parts. Several circles are formed in both hemispheres from the equator to the parallel pole.

These circles are called 'latitude lines'. It is found from 0° to 90° in the northern and southern Golardas. Thus there are 181 latitude lines. 23½° N Tropic of Cancer in Northern Hemisphere and 667° N Northern Subpolar Circle and 237° south in Tropic of Capricorn in Southern Hemisphere and 66%° S Sub-Antarctic). The latitudinal distance of every 1° is about 111 km. Which is Earth. Due to its sphericity, it differs from the equator to the poles.

Standard Time: is the mean time passing through the middle of a country, which is considered applicable to the entire country due to the inconvenience of local time. For example, the time of 82° E Yam Yatra which passes through Naini near Allahabad is standard time (IST) for the whole of India. This relieves the problem of adjusting time variation due to longitudinal difference in different regions of India.

Hence, the correct answer is option A.

Note:
Since the sun rises in the east and the earth is rotating on its axis from west to east. Therefore, the time of east is forward and the time of west is behind. This is the reason why there is a variation of time in all places of the earth. There is an hour difference on every 15° longitude. Thus, going from 0 to 180° east takes a period of 12 hours and it is 12 hours ahead of Greenwich time. Similarly, going from 0 to 180° west gives 12 hours behind Greenwich time. This is the reason that a difference of a total of 24 hours i.e. one day and night is found in 180° east and west longitude.