Latitude ( or ). It is measured in degrees, minutes and seconds or decimal degrees, north or south of the equator. The precise measurement of latitude requires an understanding of the gravitational field of the Earth, either to set up theodolites or to determine GPS satellite orbits. The study of the figure of the Earth together with its gravitational field is the science of geodesy. This article relates to coordinate systems for the Earth: it may be extended to cover the Moon, planets and other celestial objects by a simple change of nomenclature. The graticule is formed by the lines of
Dell Latitude Latitude line generally retains identical components throughout its production. This design is intended to simplify maintenance and support tasks for large corporations, allowing components to be easily swapped between models. The lines of Dell Latitude personal computers are currently in the "E" series, which is the successor to the popular Latitude D, C, and X series. The Latitudes from the early 1990s up until the C*00 lines weren't in a set "series", instead going under the models CP and XP with modifiers at the end, e.g.: XPi, CP M233. In the past, the "mainstream" line was the 6 series, being