Explanation: India is a vast country with a significant longitudinal spread, which results in a time difference between its easternmost and westernmost points. The Earth rotates from west to east, and this rotation causes different parts of the Earth to experience daylight at different times. The time difference between two places on Earth is determined by their longitudinal separation.
India spans approximately 30 degrees of longitude, from about 68°E to 97°E. The standard time in India is based on the longitude of 82.5°E, which passes through the city of Allahabad. This standard time is known as Indian Standard Time (IST) and is 5 hours and 30 minutes ahead of Coordinated Universal Time (UTC+5:30).
The easternmost state of India, Arunachal Pradesh, is located at approximately 97°E, while the westernmost state, Gujarat, is located at approximately 70°E. The longitudinal difference between these two points is about 27 degrees. Since each degree of longitude corresponds to 4 minutes of time difference, the total time difference between Arunachal Pradesh and Gujarat is approximately 2 hours.
It is important to note that while the time difference between the eastern and western extremities of India is about 2 hours, the entire country operates on a single time zone, IST. This means that even though there is a natural time difference due to the longitudinal spread, all parts of India follow the same time, which can sometimes lead to practical issues, such as sunrise and sunset times varying significantly across the country.
In summary, the time difference of two hours between Arunachal Pradesh and Gujarat is a direct result of the longitudinal spread of India and the Earth's rotation. This concept is crucial for understanding the geographical and temporal aspects of India's vast territory.