What lines divide the globe into hemispheres?

On images of the surface of the globe (globes, maps, atlases, etc.), two types of imaginary lines are drawn: meridians and parallels. The longest of the parallels, the equator, is drawn in the central part of the planet. This line is considered the border between the Northern and Southern Hemispheres. Among the meridians there is one that passes through the London suburb of Greenwich and is called zero (or initial). This meridian, together with its continuation on the other side of the planet (180 meridian), is considered the border between the Eastern and Western hemispheres.