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The history of longitude describes the centuries-long effort by astronomers, cartographers and navigators to discover a means of determining the longitude of any given place on Earth. The measurement of longitude is important to both cartography and navigation. In particular, for safe ocean navigation, knowledge of both latitude and longitude ...
Figure 1. This BLM map depicts the principal meridians and baselines used for surveying states (colored) in the PLSS. The following are the principal and guide meridians and base lines of the United States, with the year established and a brief summary of what areas' land surveys are based on each.
Module:Location map/data/USA Virginia Alexandria is a location map definition used to overlay markers and labels on an equirectangular projection map of Alexandria, Virginia. The markers are placed by latitude and longitude coordinates on the default map or a similar map image.
Location map of the District of Columbia. / 38.895; -77.015. Module:Location map/data/USA District of Columbia is a location map definition used to overlay markers and labels on an equirectangular projection map of the District of Columbia. The markers are placed by latitude and longitude coordinates on the default map or a similar map image.
Location map of USA Midwest. / 42.825; -92.25. Module:Location map/data/USA Midwest is a location map definition used to overlay markers and labels on an equirectangular projection map of USA Midwest. The markers are placed by latitude and longitude coordinates on the default map or a similar map image.
Module:Location map/data/USA Washington, D.C. is a location map definition used to overlay markers and labels on an equirectangular projection map of Washington, D.C.. The markers are placed by latitude and longitude coordinates on the default map or a similar map image.
Module:Location map/data/USA Atlanta. Module:Location map/data/USA Atlanta is a location map definition used to overlay markers and labels on an equirectangular projection map of Atlanta. The markers are placed by latitude and longitude coordinates on the default map or a similar map image.
An alternative map image, usually a relief map, which can be displayed via the relief or AlternativeMap parameters; top = 49.2 Latitude at top edge of map, in decimal degrees; bottom = 45.3 Latitude at bottom edge of map, in decimal degrees; left = -125 Longitude at left edge of map, in decimal degrees; right = -116.7 Longitude at right edge of ...