Question

Define a parallactic second?

Answer 1

Parallactic second is the unit of distance because parallactic secondis 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 arc.

Answer 2

Hey mate here is your answer》》

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 arc.

Or

Parallactic-second is the distance at which are length of one astronomical unit subtends an angle of one second of arc.

Hope this answer will help you..《《