meters:meter:1.0
feet:foot:0.3048
miles:mile:1609.344
inches:inch:2.540000e-02
centimeters:centimeter:0.01
nanometers:nanometer:1.000000e-09
microns:micron:1.000000e-06
angstroms:angstrom:1.000000e-10
decinanometers:decinanometer:1.000000e-10
yards:yard:0.9144
rods:rod:5.0292
lightyears:lightyear:9.460530e+15
USfeet:USfoot:0.30480060960121920243
USinches:USinch:.02540005080010160020
USyards:USyard:.91440182880365760731
USmiles:USmile:1609.34721869443738887477