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Parallax is defined as an object appearing as if it is positioned differently when it is looked at from different angles or different positions.
The parallax of the Sun or Moon is defined as the difference in direction as seen from the observer and from Earthâs centre. If O is the observer on the surface of Earth, E the centre of Earth, and M the position of the Moon, then the angle OME is the parallax. This varies with the altitude of the Moon.