#=>#Once a star is selected on which the scientists have to find the parallax angle,
#=># Its position is thus recorded by them(Let it be A)
#=>#Again after 6 months, the position of the same star is measured which is sure to be different . This position of the star which is measured after the 6 months is the apparent position of the star.(Let it be B)
#=>#Thus an angle is formed between a A and B is the parallax angle of the star measured in arcseconds.