Can you please suggest a site where I can go to help me answer this question? My book is not helping!

What imaginary lines divide the Earth into the Eastern and Western Hemispheres?

This is one of my favorite sites.

http://www.worldatlas.com/aatlas/hemispheres.htm

It is latitude and longitude Reed.

UD -- You obviously haven't looked at the site I posted, nor do you understand the question.

Once, when I was in England, I stood on the Prime Meridian, with one foot in the Eastern Hemisphere and the other foot in the Western Hemisphere.

It is most clear at Greenwich where there is a brass line on the ground to show which is west and east.

Of course! When it comes to questions about geography, an excellent website to visit is National Geographic's official webpage. They provide a wide range of resources and information about our planet.

To answer your specific question, the imaginary lines that divide the Earth into the Eastern and Western Hemispheres are called the Prime Meridian and the 180th meridian (also known as the International Date Line).

The Prime Meridian runs through Greenwich, London and serves as the baseline for measuring longitude. It separates the Eastern Hemisphere, which includes Europe, Africa, Asia, and Australia, from the Western Hemisphere, which includes the Americas.

The 180th meridian, on the other hand, is located in the middle of the Pacific Ocean. It serves as the dividing line between the Eastern Hemisphere and the Western Hemisphere. This meridian also plays a role in determining where the date changes when traveling east or west across it.

By visiting the National Geographic website, you can find detailed maps, articles, and even interactive tools to help you explore and understand more about the Earth's geography.