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Vertical first.
The longitude lines cover the vertical side of the earth and the latitude lines cover the horizontal side. This gives you map coordination's.
On a map that shows only a small part of the Earth's surface, the coordinate gridlooks like Cartesian " X and Y " coordinates. But as the map shows more and moreof the Earth, it starts to become apparent that the "lines" of latitude and longitudeactually represent polar coordinates on a sphere of constant radius.On a map that's sufficiently accurate, your first clue is this: Carefully measure thedistance between two of the 'vertical' lines, at the bottom of the map, and thenmeasure the distance between the same two lines at the top of the map. The twomeasurements are slightly different, because on a map of the full Earth, the 'vertical'lines all meet, at the north and south poles.
Non-vertical lines could be slanted or horizontal.
They are lines of longitude and latitude, often just longitudes and latitudes.