alt label
Parallax second
dcterms modified equal to or less than 2020-11-03T20:20:27.603Zequal to or more than 2020-11-03T20:20:27.603Z
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1199 original
definition A basic unit of astronomical distances, corresponding to a trigonometric parallax of one second of arc. In other words, it is the distance at which one astronomical unit (the mean radius of the Earth's orbit) subtends an angle of 1 arcsecond. 1 pc = 3.2616 light-years = 206,265 astronomical units = 30.857 x 10^12 km.
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