Question

Mumbai is located at 73 circ east longitude, Kolkata is located at 88 circ east longitude. Find the difference between the local time between 2 cities.

Answer 1

Hint: The latitude and longitude can be utilized to get an inexact distance between the urban areas. First off, $73^\circ$ E longitude implies it is $73^\circ$ East in reference from the prime meridian. The prime meridian partitions Earth into 2 unique halves of the globe, i.e., East and West. Also, the equator which is $0^\circ$ latitude divides the Earth into the Northern and Southern Hemisphere.

Complete answer:
Given, Mumbai is $73^\circ$ east longitude, and Kolkata is situated at $88^\circ$ east longitude.

The difference in their longitudinal degrees will be –
 Longitude degree of Kolkata - Longitude degree of Mumbai
$88^\circ - 73^\circ = 15^\circ$

Since Kolkata is in East of Mumbai and considering the local time of Mumbai is T, then the local time of Kolkata will be T = ($15 \times 4$) = 60 min

Where T is the local time of Mumbai, 15 is the longitudinal difference with the local time of Kolkata, and 4 is the minutes the sun rays make a difference for each degree longitude.

Thus, the time difference will be 60 minutes or an hour. Considering Kolkata’s time is 1 pm, then in Mumbai, it will be 2 pm (The (T) as calculated above). However, the real-time will remain the same as in India we follow the Indian Standard time i.e. one time everywhere in the country.

Note:It is important to note that the time differences are mediated by the use of Indian Standard Time (IST). Mirzapur, Uttar Pradesh ($82.5^\circ E$) is used for the reference. Also, that $1^\circ$ of longitude is equal to 4 minutes.