The number of degrees of longitude between the Prime Meridian and the International Date Line is approximately 180 degrees. The Prime Meridian is defined as 0° longitude, running through Greenwich, England, while the International Date Line is roughly based on the 180° longitude meridian, located halfway around the world from the Prime Meridian

. Although the International Date Line generally follows the 180° meridian, it deviates in places to accommodate political and territorial boundaries, but the angular distance remains about 180 degrees

. This line serves as the boundary between calendar days, marking the transition between one day and the next. In summary:

• Prime Meridian = 0° longitude
• International Date Line ≈ 180° longitude
• Degrees of longitude between them = 180°

This means they are on opposite sides of the Earth, separated by half the globe's circumference in terms of longitude