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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+
The palm may be either one of two obsolete non-SI units of measurement of length.
In English usage the palm, or small palm, also called handbreadth or handsbreadth, was ..more definition+
In relation to the base unit of [length] => (meters), 1 Siriometer (sir) is equal to 1.496E+17 meters, while 1 Palms (palm) = 0.0762 meters.| 21 Siriometer | to common length units |
|---|---|
| 21 sir | = 3.1416E+18 meters (m) |
| 21 sir | = 3.1416E+15 kilometers (km) |
| 21 sir | = 3.1416E+20 centimeters (cm) |
| 21 sir | = 1.0307086614173E+19 feet (ft) |
| 21 sir | = 1.2368503937008E+20 inches (in) |
| 21 sir | = 3.4356955380577E+18 yards (yd) |
| 21 sir | = 1.9520997375328E+15 miles (mi) |
| 21 sir | = 332.05792199556 light years (ly) |
| 21 sir | = 1.1873765275435E+22 pixels (PX) |
| 21 sir | = 1.9635E+53 planck length (pl) |