Table 7.9 — Non-SI EUs not accepted for use with the SI
Label Symbol Quantity Concept definition EQ label Code Reference type Reference Supplemental references
ASTRONOMICAL_UNIT AU length The mean distance of <EARTH> from the <SUN>.
1 AU = 1,495 978 7 x 1011 m (approximately).		 LENGTH 7 PR ISO 80000-3:2006, item 3-1.C.b  
FOOT ft length 1 ft = 0,304 8 m (exactly). LENGTH 51 PR ISO 80000-3:2006, item 3-1.B.b  
GAL Gal acceleration dv/dt, where v is velocity ISO 80000-3:2006, item 3-8.1 and t is time ISO 80000-3:2006, item 3-7.
1 Gal = 0,01 m/s2 (exactly).		 ACCELERATION 52 PR ISO 80000-3:2006, item 3-9.A.a  
KILOPOUND kp mass 1 kip = 453,592 37 kg (exactly). MASS 126 PR ISO 80000-4:2006, item 4-1.B.e ISO 80000-1:2009, 6.5.4
LIGHT_YEAR l.y. length The distance travelled in 1 year by light in vacuum.
1 l.y. = 9,460 730 x 1015 m (exactly).		 LENGTH 129 PR ISO 80000-3:2006, item 3-1.C.a  
LONG_TON ton (long) mass 1 long ton (US) = 1 ton (UK) = 1 016,047 kg (exactly). MASS 133 PR ISO 80000-4:2006, item 4-1.B.f (Conversion factors and remarks)  
MILE mile length 1 mile = 1 609,344 m (exactly). LENGTH 148 PR ISO 80000-3:2006, item 3-1.B.d  
MILE_PER_HOUR mile/h velocity dr/dt, where r is position vector ISO 80000-3:2006, item 3-1.11 and t is time ISO 80000-3:2006, item 3-7.
1 mile/h = 0,447 04 m/s (exactly).		 SPEED 149 PR ISO 80000-3:2006, item 3-8.B.b and item 3-8.1  
PARSEC pc length The distance at which 1 astronomical unit subtends an angle of 1 second of arc.
1 pc = 206 264,8 AU = 30,856 78 x 1015 m (approximately).		 LENGTH 172 PR ISO 80000-3:2006, item 3-1.C.c  
TON ton mass 1 ton (US) = 907,184 7 kg (exactly). MASS 217 PR ISO 80000-4:2006, item 4-1.B.g (Conversion factors and remarks)  
YEAR a time (annum) The duration between two successive passages of the <SUN> through the vernal equinox.
1 year = 365,242 20 d = 31 556 926 s (approximately).		 TIME 245 PR ISO 80000-3:2006, item 3-7.C.a  

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