Parsec definition (video) | Stellar parallax | Khan Academy
How many light years make 1 par sec ? - YouTube
What is a parsec? Find out on EarthSky. | Space | EarthSky
How would I find the distance of a star in parsecs and light years if parallax is known? For example, Sirius, the brightest star in the sky, has a parallax of 0.379
Parsecs, astronomical units and light years, distance units explained: fizzics.org - YouTube