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## Main Question or Discussion Point

Hai..

One 'parsec' is the distance from a star which makes an angle of 1''(1/60 of a degree)with the sun and earth(1.5*10^8 km).So by measuring an angle of 1'' we can measure to a maximum of 2 parsec.

But this only about 7 light years and we are speaking of much much bigger astronomical distances.How these are measured.

Thanks...

Jay

One 'parsec' is the distance from a star which makes an angle of 1''(1/60 of a degree)with the sun and earth(1.5*10^8 km).So by measuring an angle of 1'' we can measure to a maximum of 2 parsec.

But this only about 7 light years and we are speaking of much much bigger astronomical distances.How these are measured.

Thanks...

Jay