Question

Define one parollactic second what is its value?
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Answer 1

Answer:

Explanation: Parallactic second is the unit of distance because parallactic second is abbrevistion of parsec.

Parsec = Parsec is the unit for larger distances.It is the distance at which a star would make parallax of one second of arc.

1 parsec =3.26 light years

The physical meaning of parsec can be explained as the distance at which the line drawn through Earth's centre and the Sun will intersect substending a 1 second angle with each other.

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Answer 2

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

Since θ=lrθ=lr

Where l is the arc length at a distance r and θθ is the angle subtended in radians, so

r=lθr=lθ

l=I.A.U=1.49×1011ml=I.A.U=1.49×1011m

θ=1sec=160×160θ=1sec=160×160 degree

=160×160×π180=160×160×π180

So, 1 parsec =1A.U1sec=1A.U1sec

=3.1×1016m