simple Parallax equation redux

"OG" wrote in message ...

What do you have so far ?

Stellar parallax is the angle subtended by the radius of the Earth's orbit
at the star.
http://en.wikipedia.org/wiki/Parallax#Stellar_parallax

Radius of Earth's orbit is appx 150,000,000 km

The distance to the star is
150,000,000 / sin (parallax)

Which gives you a measurement in km

You then divide by the number of km in a light year.


Thanks for the help. From that article, it appears that a simplified
equation for earth-orbit parallax is

parallax (in arcseconds) = 1 / distance (in parsecs)

Am I reading that correctly?