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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.| 55 Siriometer | to common length units |
|---|---|
| 55 sir | = 8.228E+18 meters (m) |
| 55 sir | = 8.228E+15 kilometers (km) |
| 55 sir | = 8.228E+20 centimeters (cm) |
| 55 sir | = 2.6994750656168E+19 feet (ft) |
| 55 sir | = 3.2393700787402E+20 inches (in) |
| 55 sir | = 8.9982502187227E+18 yards (yd) |
| 55 sir | = 5.1126421697288E+15 miles (mi) |
| 55 sir | = 869.67550998837 light years (ly) |
| 55 sir | = 3.1097956673758E+22 pixels (PX) |
| 55 sir | = 5.1425E+53 planck length (pl) |