Bir parsek bir astronomik birimin bir arksaniyelik bir dereceye karşılık geldiği mesafedir.
- One parsec is the distance at which one astronomical unit subtends an angle of one arcsecond.
Birinin çözümü, ötekinin çözümünü kanıtlayabilir.
- The solution of one may prove to be the solution of the other.
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