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Because of the body's rotation and orbital alignment with the observer the central meridian changes with time, as it is based on the observer's point of view. For example, consider the Earth as seen from the Moon. There will be a meridian going through the centre of the Earth's visible disc (for
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example 75° West). This is not always the Earth's prime meridian (0° W / 0° E), as the central meridian of the Earth as seen from the Moon changes as the Earth rotates.
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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
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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.
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of a celestial body that presents a disc to an observer (such as
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