Central meridian may mean:

• Central meridian (astronomy), the meridian that goes through the centre of the body's disc as seen from the point of view of the observer
• Central meridian (map projections), a line used to define the origin of some map projections

• Prime meridian, any of many central meridians used to define the origin of terrestrial or planetary longitudes
• Principal meridian, a meridian used for survey control in a large region.

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