Lines of longitude are also known as what?

Lines of longitude, which run from the North Pole to the South Pole, are referred to as meridians. This terminology arises from the fact that meridians help measure the Earth's east-west position in relation to the Prime Meridian.

Meridians are essential for navigation and global positioning, as they provide a framework for determining geographic coordinates along with lines of latitude. While lines of latitude are called parallels because they run parallel to each other across the globe, meridians do not maintain a consistent distance apart; they converge at the poles. The concept of great circles refers to any circle drawn on the globe that divides it into two equal halves and is not limited to longitude lines, as it can include lines of latitude as well, particularly the equator.