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The siriometer is a rarely used and an obsolete astronomical unit of length, defined to be equal to about one million astronomical units (au). One siriometer is approxim ..more definition+
In relation to the base unit of [length] => (meters), 1 Femtometers (fm) is equal to 1.0E-15 meters, while 1 Siriometer (sir) = 1.496E+17 meters.| 218500 Femtometers | to common length units |
|---|---|
| 218500 fm | = 2.185E-10 meters (m) |
| 218500 fm | = 2.185E-13 kilometers (km) |
| 218500 fm | = 2.185E-8 centimeters (cm) |
| 218500 fm | = 7.1686351706037E-10 feet (ft) |
| 218500 fm | = 8.6023622047244E-9 inches (in) |
| 218500 fm | = 2.3895450568679E-10 yards (yd) |
| 218500 fm | = 1.3576960550386E-13 miles (mi) |
| 218500 fm | = 2.3094810273755E-26 light years (ly) |
| 218500 fm | = 8.2582687569472E-7 pixels (PX) |
| 218500 fm | = 1.365625E+25 planck length (pl) |