Which of the following best defines latitude?

Latitude is best defined as a measure of distance North and South of the equator. It is an essential geographic coordinate that helps pinpoint locations on the Earth's surface. Latitude lines, which run parallel to the equator, are expressed in degrees, with the equator at 0 degrees and the North and South Poles at 90 degrees North and 90 degrees South, respectively.

Understanding latitude is crucial for navigation, as it directly influences flight paths, airspace regulations, and geographical orientation. It also assists pilots and air traffic controllers in maintaining safe altitudes and fuel management during flights. This significance extends to various aviation operations, including those within the National Airspace System (NAS), as proper navigation is paramount for ensuring safety and efficiency in flight.