Straightforward Parallax

You are trying to measure the distance to a star. You are able to measure that over 6 months the position of the star shifts by an angle (2a(2a—see the diagram)) of 0.1 arcseconds.

Taking the distance from Earth to the sun to be 1.5×1011meter1.5\times 10^{11} \si{meter}, calculate the distance to the star in meters.

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