What defines Longitude?

Longitude is defined as meridians that measure degrees east and west of the prime meridian. This definition is crucial for understanding how we navigate and locate places on Earth. The prime meridian, which runs through Greenwich, England, is considered the starting point for measuring longitude. Each meridian is a line that extends from the North Pole to the South Pole, and the degrees of longitude help pinpoint locations in relation to this prime meridian.

By measuring the angular distance from the prime meridian, we can identify how far east or west a location is positioned. For example, a location at 30 degrees east longitude is positioned 30 degrees to the east of the prime meridian, while a location at 45 degrees west is 45 degrees to the west. This system of measurement allows for precise navigation and mapping.

The other options inaccurately describe longitude. The first option refers to latitude, which measures degrees north and south of the equator. The third option relates to climate zones rather than geographic location, and the fourth option discusses circles related to the Earth's structure rather than the coordinate system used for navigation. Understanding longitude is essential for geography and travel, as it allows for accurate positioning on the globe.