Reasons for the time difference between Arunachal Pradesh and Gujarat:

There are two main factors that contribute to the time difference between Arunachal Pradesh and Gujarat:

1. Longitude:
- Arunachal Pradesh is located in the easternmost part of India, while Gujarat is situated in the western part.
- The Earth rotates from west to east, causing the sun to appear to rise in the east and set in the west.
- Since Arunachal Pradesh is farther east than Gujarat, it experiences sunrise earlier.

2. Time Zones:
- India follows the Indian Standard Time (IST), which is based on the longitude of 82.5°E.
- However, for practical reasons, the entire country uses a single time zone, regardless of its actual geographic location.
- This means that the time in Arunachal Pradesh is the same as in Gujarat, even though the sun rises earlier in Arunachal Pradesh.

Explanation of how the watch shows the same time:

The reason why the watch shows the same time in both Arunachal Pradesh and Gujarat, despite the time difference caused by the sunrise, is because the entire country follows a single time zone. This time zone is based on the longitude of 82.5°E, which is roughly the center of the country.

The concept of time zones was established to ensure uniformity in timekeeping across different regions. It allows for easy coordination of activities such as transportation, communication, and scheduling. By using a single time zone, India avoids the need for adjusting clocks and watches as one travels from one place to another within the country.

Although the sun rises earlier in Arunachal Pradesh, the local time is adjusted to match the Indian Standard Time (IST) used throughout the country. This means that people in Arunachal Pradesh, as well as in Gujarat, follow the same time as dictated by the watch, even if it does not align with the natural daylight hours.

In summary, the time difference between Arunachal Pradesh and Gujarat is due to their different longitudes, causing the sun to rise earlier in Arunachal Pradesh. However, the watch shows the same time in both regions because India follows a single time zone, regardless of the actual geographic location.