Astronomical Distance? What is Parsec ,Astronomical Unit and Light year?

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 Hii good morning to you to understand the true meaning of astronomical distance .

We know the distance between earth and sun is about 1.5 × 10^11m. this distance between sun and earth is known as astronomical unit but there is a catch  i.e the distance between sun and eath changes . hence we take average ar mean distance . so ,the mean distance between earth and sun is known as Astronomical Unit.

hence 1AU= 1.496*10^11m

now for Light year it is define as distance taken by light in year  to travell across stars or other galactical object.

1 lY=9.6*10^11m

The measurement of parsec is slightly overwhelming 



as we knew the distance between sun and earth is 1AU  . now to find the distance between earth and that star we can measure it using the angle subtended(1arcsec)  .

we know
1 arcsec=1/3600
1"=1/3600 * π/180        |(radian)
1"=4.84*10^-6 rad

as the angle is very small : R/D=1''
R=1.496*10^11m 
1.496*10^11m /D= 4.84*10^-6

D=3.1*10^16m 
Hence 1parsec =3.1*10^16m

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CONVERSION

1LY=6.323*10^4 AU

1PC=3.262 LY

1PC= 2.062*10^5 AU


THANK YOU HOPE YOU ALL  UNDERSTAND THIS ...

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