Lines of Latitude encircle the Earth horizontally, and are parallel to the Equator. Lines of Latitude are intercepted by Lines of Longitude. Lines of Longitude run vertically from the North Pole to the South Pole. The Prime Meridian is zero longitude and passes through the Greenwich Observatory, Greenwich, London, England.
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The lines that intersect latitude lines on a map are lines of longitude. These lines run from the North Pole to the South Pole and help determine the east-west position of a location on the Earth's surface.
There are an infinite number of possible lines of latitude, and there are an infinite number
of possible lines of longitude. Every possible latitude line intersects every possible longitude
line, and every possible longitude line intersects every possible latitude line. Every one of
the infinite number of points on Earth is the intersection of one of each, and there is no
particular name for it.
The critical rule for reading a map to determine grid coordinates is to first determine the longitude (vertical lines) and then the latitude (horizontal lines) on the map that intersect at the point of interest. The grid coordinates are then expressed as a combination of the longitude and latitude lines.
First, look on the map to find the line of latitude that the coordinates reference. If the exact line of latitude isn't shown on the map, estimate it by looking at the lines that are available. Then look on the map to find the longitude line that the coordinates reference. Once you have found the two lines, follow them both towards the point where they intersect. That is the location the coordinates reference.
Lines of latitude on a polar projection map radiate outward from the center towards the edges of the map. On a polar projection map, the North Pole is typically at the center, while lines of latitude move southward towards the map edges.
grid lines of longitude and latitude
You find the lines of latitude and longitude and find the place that they intersect, which is your location.