What is parsec?
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Parallactic second or parsec is a unit of cosmic distance. To understand this one needs to have an understanding of parallax. Extend one finger forward and close the right eye and look through the left eye. Keeping the position of your hand fixed, open the right eye and close the left eye. It seems that the position of the fingers has changed. But the fingers were still.
Similarly, when the clock strikes exactly midnight if you look straight ahead at the clock, it seems to be midnight. But looking from the left side, it seems 1 minute past midnight, and looking from the right side, it seems 1 minute left to midnight. The apparent change in the position of an object based on the position of the viewer is called parallax or optical illusion.
The distance at which an object produces a parallax of an angular distance of 1 arc second is called 1 parsec. 1 parsec = 3.26 light years.