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Physics LibreTexts

11.14: Parsec Vs. Light-Year Measurement

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Astronomers also employ other types of measurements, specifically the parsec (pc). The parsec is defined as the distance to an object with a parallax angle of 1 arcsecond. This takes us back to our measurements using parallax. When determining the relationship between the pc and ly , one finds that:1 pc = 3. 261 light years (ly) = 1. 9174 x 1012 mi = 3. 0857 x 1013 km. M

The parsec was named from the abbreviations of a par allax of one arc sec ond. The idea of the parsec was to provide astronomers a method to calculate stellar and other astronomical distances quickly and with ease from their data. The parsec is preferred by astronomers, whereas the light-year is more popular in science texts and everyday use.


This page titled 11.14: Parsec Vs. Light-Year Measurement is shared under a CC BY 4.0 license and was authored, remixed, and/or curated by Lumen Learning via source content that was edited to the style and standards of the LibreTexts platform.

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