How many parallactic second in one astronomical unit?
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A parsec is defined as the distance at which one astronomical unit subtends an angle of one arcsecond, which corresponds to648000π astronomical units. One parsec is equal to about 3.26 light-years (30 trillion km or 19 trillion miles) in length.Parallactic second is the unit of distance because parallactic second is abbreviation of parsec. Parsec: Parsec is the unit for larger distances .It is the distance at which star would make parallax of one second of arcBasically, it's a unit of length used to measure the astronomically large distances between objects beyond our Solar System. One parsec is the distance at which one astronomical unit subtends an angle of one arcsecond.One light year is almost six trillion miles. And an astronomical unit is the average distance between the earth and the sun. So the distance to the sun is by definition one AU. A parsec is the distance at which one astronomical unit subtends an angle of one second of arc.