What is a characteristic of lines of longitude?

Lines of longitude, also known as meridians, are the vertical lines that run from the North Pole to the South Pole. A defining characteristic of these lines is that they intersect the equator at right angles. This crossing forms distinct angles, allowing for accurate geographic positioning and navigation. The alignment at right angles to the equator is essential in defining how we measure the Earth's surface and understand global coordinates.

Lines of longitude are not parallel to the equator; instead, they converge at the poles. They also do not run horizontally or are measured in nautical miles, as those attributes are associated with lines of latitude and distance measurement on the Earth's surface. Understanding the structure of lines of longitude helps in grasping navigation and mapping techniques essential for aviation and other fields.