Prime Meridian vs. Standard Meridian
Prime Meridian and Standard Meridian are both important lines of longitude used in geography and cartography. While they may seem similar, they serve different purposes and are located in different positions on the Earth's surface.

Prime Meridian:
The Prime Meridian is the line of longitude that is designated as 0 degrees. It is the starting point for measuring longitude and divides the Earth into the Eastern and Western Hemispheres. The Prime Meridian runs through Greenwich, London, and is used as the reference point for determining time zones around the world. It is also known as the Greenwich Meridian.

Standard Meridian:
The Standard Meridian, on the other hand, is a specific line of longitude that is chosen as the reference point for a particular region or country. It is used to establish the local time for that region and to determine the offset from Coordinated Universal Time (UTC). Each country or region may have its own Standard Meridian, which is typically chosen based on the geographical center or importance of that area.

Differences:
1. Location: The Prime Meridian is fixed at 0 degrees longitude and runs through Greenwich, London, while Standard Meridians can vary depending on the region or country.
2. Function: The Prime Meridian serves as the reference point for measuring longitude globally and determining time zones, while Standard Meridians are specific to a particular region for timekeeping purposes.
3. Usage: The Prime Meridian is universally recognized and used for international coordination, while Standard Meridians are more localized and specific to individual countries or regions.
In conclusion, while both the Prime Meridian and Standard Meridians play important roles in geography and timekeeping, they differ in their locations, functions, and usage. Understanding the distinctions between these lines of longitude is crucial for accurate mapping and timekeeping on a global scale.