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- meridian passage
- meridian photometer
- meridian photometry
- meridian plane
- Meridian Project
- Meridian satellite
- meridian section
- meridian surface
- meridian system
- meridian transit
- meridian wire
- meridian zenith distance
- meridiem
- meridional aberration
- meridional channel
- meridional circulation
- meridional coma
- meridional component
- meridional flow
- meridional focal line
- meridional overturning circulation
- meridional parts
- meridional plane
- meridional ray
- meridional structural system