This corresponds to the small-angle definition of the parsec found in many astronomical references. Question: An astronomical unit (AU) is equal to the average distance from Earth to the Sun, about 92.9 × 106 mi. In August 2015, the International Astronomical Union (IAU) passed Resolution B2 which, as part of the definition of a standardized absolute and apparent bolometric magnitude scale, mentioned an existing explicit definition of the parsec as exactly 648 000 / π au, or approximately 30.856 775 814 913 673 ×10 15 metres (based on the IAU 2012 exact SI definition of the astronomical unit). Distance in the metric sense is a measure between any two A to Z points. Convert length of parsec (pc) and astronomical units (au - ua) units in reverse from astronomical units into parsecs. Although parsecs are used for the shorter distances within the Milky Way, multiples of parsecs are required for the larger scales in the universe, including kiloparsecs (kpc) for the more distant objects within and around the Milky Way, megaparsecs (Mpc) for mid-distance galaxies, and gigaparsecs (Gpc) for many quasars and the most distant galaxies. Conversion chart - parsecs to astronomical units Category: main menu length menu Parsecs. For distances on galactic and intergalactic scales, kiloparsec (kpc) and. Partly for this reason, it is the unit preferred in astronomy and astrophysics, though the light-year remains prominent in popular science texts and common usage. One parsec equals 3.2616 light years, 206 265 astronomical units, or 30.857 × 1012 km. The word parsec is a portmanteau of "parallax of one second" and was coined by the British astronomer Herbert Hall Turner in 1913 to make calculations of astronomical distances from only raw observational data easy for astronomers. A parsec is the distance from the Sun to an astronomical object that has a parallax angle of one arcsecond (not to scale)
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