Question

the imaginary line separates the Earth 2 calendar days​

Answer 1

Answer:

International Date Line

The International Date Line lies on the opposite side of the world to the Prime Meridian (The Prime Meridian passes through Greenwich in London. It separates the Eastern and Western Hemispheres). The International Date Line separates two consecutive calendar days.

Answer 2

Answer:

Line of demarcation

Explanation:

It is located halfway round the world from the prime meridian—the zero degrees longitude established in Greenwich, England, in 1852. The International Date Line functions as a “ line of demarcation ” separating two consecutive calendar dates. When you cross the date line, you become a time traveler of sorts!