Parsec
Emergence definition
parsec requires parallax, light-year.
Wiktionary senses
Historical origin
Prerequisite chain
Neighborhood
In other languages
Prerequisites
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A unit of distance in astronomy, equal to 3.
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26 light-years, defined as the distance at which one astronomical unit subtends an angle of one arcsecond.
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A parsec is defined based on the parallax shift of one arcsecond.
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The parsec unit is related to parallax measurements, another distance metric.