Astronomical units of measure
by
Michele Bortolotti
Astronomical Unit
(A.U.): average distance between Earth and the Sun.
Light-year
(l.-y.): distance covered in one year by the light, at the speed of 299.793 km/s.
Parsec
(pc): distance from which an observer would see the major semi-axis of the terrestrial orbit under the angle of 1''.
Unit of measure
corresponds to:
km
A.U.
l.-y.
pc
Astronomical Unit (A.U.)
149.600.000
1
0,0000158
0,0000048
Light-year (l.-y.)
9.463 milliards
63.240
1
0,307
Parsec (pc)
30.824 milliards
205.993
3,257
1
Conversion table
(Netscape 3.0+ / MSIE 4.0+)
millions kilometers
Astronomical Units
Light-years
Parsec
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