Meridians of longitude

Meridians of longitude are imagined lines, with 15-degree intervals, from pole to pole, and a form of great circles.

Remember: Meridians of longitude (imagined lines)       longitude (a position)

The meridian’s position (longitude) and Latitude can be described by degrees, minutes and second:

Morover, Meridians of longitude is perpendicular to Parallel of latitdue on the earth’s surfaceand they form Graticule

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