Editing Navigation (section)

===Latitude===
{{Further|Latitude}}
Roughly, the latitude of a place on Earth is its angular distance north or south of the [[equator]].<ref name="bow4">Bowditch, 2003:4.</ref> Latitude is usually expressed in [[degree (angle)|degrees]] (marked with °) ranging from 0° at the [[Equator]] to 90° at the North and South poles.<ref name="bow4"/> The latitude of the [[North Pole]] is 90° N, and the latitude of the [[South Pole]] is 90° S.<ref name="bow4" /> Mariners calculated latitude in the Northern Hemisphere by sighting the [[pole star]] ([[Polaris]]) with a [[sextant]] and using sight reduction tables to correct for height of eye and atmospheric refraction. The height of Polaris in degrees above the horizon is the latitude of the observer, within a degree or so.