Reason for the difference in local time between the easternmost and westernmost parts:

There is a difference of two hours in local time between the easternmost part and the westernmost part due to the concept of time zones. Time zones are regions of the Earth that have the same standard time. The primary reason for the existence of time zones is to account for the Earth's rotation and facilitate standardized timekeeping across different regions.

Rotation of the Earth:
The Earth rotates on its axis, completing one full rotation in approximately 24 hours. This rotation causes different parts of the Earth to experience daylight and darkness at different times. As a result, time varies across different longitudes.

Standardization of Time:
To ensure uniformity and ease of communication, it became necessary to establish a standardized system of timekeeping. This led to the creation of time zones. The Earth is divided into 24 time zones, each covering approximately 15 degrees of longitude. Each time zone is usually one hour apart from its neighboring zones.

Easternmost and Westernmost Parts:
The easternmost part and the westernmost part mentioned in the question refer to the extreme points of the Earth's longitudinal range. The easternmost part is typically considered to be the International Date Line (IDL) in the Pacific Ocean, near the 180-degree longitude. The westernmost part refers to the 0-degree longitude, also known as the Prime Meridian, which passes through Greenwich, London.

Difference of Two Hours:
Since each time zone is generally one hour apart, the difference of two hours between the easternmost and westernmost parts can be attributed to the fact that there are two time zones separating them. As one moves from the westernmost point to the easternmost point, they cross multiple time zone boundaries, resulting in a time difference of two hours.

Practical Implications:
The difference in local time between the easternmost and westernmost parts has implications for various aspects of life, such as international travel, telecommunications, and global commerce. It helps in scheduling events, coordinating activities, and ensuring accurate timekeeping across different regions.

Conclusion:
The difference of two hours in local time between the easternmost and westernmost parts is a result of the Earth's rotation and the establishment of time zones. Time zones facilitate standardized timekeeping and ensure uniformity in different regions. The concept of time zones is essential for efficient global communication and coordination.