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| | Ephemerides of the Largest Asteroids (Site not responding. Last check: 2007-10-22) |
 | | The accuracy of the observations varied significantly depending on the type of observation, the equipment used, the observatory making the observation and the epoch of the observation so, the weighting of the observations had to be carefully considered. |
 | | Second, During the early part of the twentieth century, several new observatories, such as Bucharest, Athens, Purple Mountain, Santiago-San Bernardo, and Madrid, began contributing observations that were significantly worse, at least initially, than the older established observatories. |
 | | For example, the Bucharest Observatory contributed 2863 observations; however, the root-mean-square value of the residuals of the Bucharest observations was 5.1 times greater than similar observations at other observatories during the same era. |
| aa.usno.navy.mil /hilton/ephemerides/asteroid_ephemerides.html (9264 words) |
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