Standard Parallels & Central Meridians

Standard Parallels & Central Meridians

• Standard Parallels: the secants, no distortion along them. At 1/6 of zone width from zone edges
• Central Meridians: a meridian at the middle of the zone, defines the Y axis direction.
• The Y axis points to the grid north, which is the geodetic north only at the central meridian
• To compute the grid azimuth ( from grid north) from geodetic azimuth ( from geodetic north):

grid azimuth = geodetic azimuth - q

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