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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 distance from the Earth of objects in the Solar System can be measured using radar. A pulse is sent out and the time taken for the reflected pulse to be received is recorded.b) the parallax of the star is smaller than that of the 'star' at A. Figure 2 shows the use of parallax to measure the distance of an actual star say Alpha Centauri. This time the 'base line' is the diameter of the Earth's orbit in other words a line joining the position of the Earth at two points six months apart.