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For the relation of this inequality to the solar parallax see Moon.
Brown the value of the solar parallax derived by this method is about 8.773".
To obtain the true parallax, the mean parallax of the comparison stars must be added to this relative parallax.
Annual parallax is the angle between the direction in which a star appears from the earth and the direction in which it appears from the centre of the sun.
It is, the orbit and periodic time is known, and also the parallax, the masses of the stars can be found.