Define a Astronomical Unit.

Define - Astronomical unit?

Define astronomical unit.

Define Astronomical unit, light year and parsec.

Define Astronomical unit, light year and parscond. Establish relation between them.

Define astronomical unit (A.U), write its value in metres.

How many parallactic second are there inone Astronomical unit? 1 parallactic second =3.08xx10^(16)m 1 Astronomical unit =1.496xx10^(11)m

The distance between the sun and earth is one astronomical unit. Find the time taken by the sunlight to reach the earth.