Well, what are eastern and western hemispheres divided by?

Question

???

Answer 1

I thought the Greenwich, England prime meridian line was just the line of longitude determined to be at 0 (zero) degrees.

And, after looking it up on Wikipedia, I see that you're right.

However, 'most' people tend to accept the difference between the east/west hemispheres as just 'somewhere' in the middle of the Atlantic. Otherwise, the western portion of Europe (and Africa) is technically in the Western Hemisphere.

This is like telling someone the time is 1pm when its actually 12:56pm.

Technically incorrect - but generally accepted.

Answer 2

The Prime Meridian, this separates East from West, these regions are called hemispheres.

Answer 3

An imaginary line called the prime meridian that goes through Greenwich England and passes through both poles.