Question
Define parsec. Is it the same as the Astronomical unit?

Answer

Parsec refers to the distance at which an arc of length equal to $1$ astronomical unit subtends an angle of one second at a point.
No, a parsec is not the same as the astronomical unit $(A.U.).$
$1 \text { Parsec }=2 \times 10^5 \text { A.U. }$

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