Final answer:
The Prime Meridian runs through Greenwich, England. It is located at the Royal Observatory and marks the division between the Eastern and Western Hemispheres at 0 degrees longitude.
Step-by-step explanation:
The Prime Meridian runs through the city of Greenwich. It is defined as an imaginary line that runs through the Royal Observatory in Greenwich, England, which is a suburb of London. This meridian is at 0 degrees longitude and is the starting point for measuring longitude, dividing the Earth into the Eastern and Western Hemispheres. The significance of the Prime Meridian was agreed upon internationally after much debate, with many countries having wanted the 0° longitude to pass through their own capital. However, Greenwich was chosen primarily because it was already the site of much development in the method to measure longitude at sea, which was crucial for navigation.
By tradition, when people visit the Royal Observatory in Greenwich, they often take photographs while straddling the Prime Meridian - one foot in the Eastern Hemisphere and the other in the Western Hemisphere. This historical location plays a critical role in global navigation and timekeeping practices.