The central meridian of a celestial body that presents a disc to an observer (such as planet, moon, or star) is the meridian on the body's surface that goes through the centre of the body's disc as seen from the point of view of the observer.
[1] The term as generally used in observational astronomy refers to the central meridian of the celestial body as seen by a theoretical observer on Earth for whom the celestial body is at the zenith.
An imaginary line is drawn from the centre of the Earth to the center of the other celestial body.
The intersection between this line and the celestial body's surface is the sub-Earth point.
There will be a meridian going through the centre of the Earth's visible disc (for example 75° West).