![]() Sample task: convert 5 light years to parsecs. See the detailed calculation example below. Simply divide the measure in light years by 3.26 to get the equivalent in parsecs. ![]() ![]() Knowing that there are 3.26 light-years in a parsec it is apparent that division is needed in the conversion of ly to pc. These qualities make the parsec less suitable as a universal distance unit as compared to the light year. However, this also means it is based on two arbitrary quantities: the radius of our planet's orbit and the arbitrary choice to divide a circle in 360 degrees (base 60 system). The parsec is defined as the distance at which a star will show an annual parallax of one arcsecond meaning they have particular utility for Earth-based astronomical observations. This makes light years the unit of choice when it comes to expressing the vast distances between astronomical bodies. A year is an Earth-centric measure of time, but other than that the definition of a light-year depends only on the speed of light which is a universal physics constant. Light years express the distance covered by light in one year's time. This page provides you how to convert between feet and light year with conversion factor. Difference between Light years and Parsecs The international symbol for light years is "ly" whereas for parsec it is "pc" so we can write 1 pc = 3.26 ly. ![]() There are approximately 3.26 light years in one parsec (3.261563 accurate to six digits after the decimal point). Difference between Light years and Parsecs. ![]()
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