Astronomy 101: What’s A Parsec?

One of my favorite misuse of the term, parsec, comes from the original Star Wars. Han Solo boasts about the SPEED of the Millennium Falcon in parsec…waa? LOL!

Astronomy and Law

1 Parsec =3.08567758 × 1016 meters.  There that was easy wasn’t it?  Ok, that isn’t all of it.


A parsec is an astronomical unit of distance derived by the theoretical annual parallax (or heliocentric parallax) of one arc second, and is found as the inverse of that measured parallax.  Got it?  No?  The image above makes it a little easier to understand.  In practical terms, one parsec equals about 3.26 light-years (30.9 trillion kilometres or 19.2 trillion miles).

The formula to calculate a parsec isn’t that hard (luckily most of the units cancel each other and you are left meters).

So why do we use parsec? Because until about 1964, the speed of light wasn’t really agreed upon, so no light-years until then, and scientists needed a way to make quick calculations of astronomical distances.  Parsec is named from the abbreviation of the parallax of one arc

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Author: deWriterMD

In the fall of 1999, I was ordained as a metaphysical minister in the Order of Melchizedek, ordained by Reverend Dan Chesbro and became a member of the Sanctuary of the Beloved (New York). I studied further under Reverend Brown at the United Metaphysical Churches of America in Roanoke, Virginia, which had its origins in the Spiritualist Movement. I am also a Master Teacher of Sekhem Seichim Reiki with over eleven years of experience practicing and teaching Reiki. I have also given messages and ‘sermons’ at Arlington Metaphysical Chapel (Virginia), where I led adult study classes on a variety of esoteric topics. My online group, One with Spirit Meta-Journal Forum, has been going strong since early 2002. I'm also known for my Psychic Portraits, art from beyond the physical.

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