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:
The imaginary vertical lines on the globe are known as longitudes. They help us in locating places in the world as well as determine their time.

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.Due to the differences of longitude and latitude, every place has its distinct local times. But to get rid of the differences across the country, we have adopted Indian Standard Time(IST)