Kilometers to Parsecs

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vCalc.Kilometers to Parsecs
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The Kilometers to Parsecscalculator converts a measurement of length in kilometers to parsecs.

INSTRUCTIONS: Choose units and enter the following:

• (km)  This is the distance in kilometers

Parsec(PC):  The calculator returns the distance in parsecs.  However, this can be automatically converted to other units via the pull-down menu.

The Math / Science

A parsec was traditionally defined as the distance where one astronomical unit subtends an angle of one arcsecond.  A parsec was redefined in 2015 to 648000/π astronomical units.  Proxima Centauri, is the nearest star to the Sun and is approximately 1.3 parsecs (4.2 light-years) from the Sun.

Parsecs are often used in astronomy calculations is a simple linear transform.