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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+
Plethron is a measurement used in Ancient times, equal to 100 Greek feet (pous). It was roughly the width of a typical athletic running-track, and was used as the st ..more definition+
In relation to the base unit of [length] => (meters), 1 Siriometer (sir) is equal to 1.496E+17 meters, while 1 Greek Plethron (pleth) = 30.8 meters.| 139000000000 Siriometer | to common length units |
|---|---|
| 139000000000 sir | = 2.07944E+28 meters (m) |
| 139000000000 sir | = 2.07944E+25 kilometers (km) |
| 139000000000 sir | = 2.07944E+30 centimeters (cm) |
| 139000000000 sir | = 6.8223097112861E+28 feet (ft) |
| 139000000000 sir | = 8.1867716535433E+29 inches (in) |
| 139000000000 sir | = 2.2741032370954E+28 yards (yd) |
| 139000000000 sir | = 1.292104111986E+25 miles (mi) |
| 139000000000 sir | = 2197907197970.6 light years (ly) |
| 139000000000 sir | = 7.8593017775498E+31 pixels (PX) |
| 139000000000 sir | = 1.29965E+63 planck length (pl) |