gives me is significantly different from what Ive found in another source (like a magazine, or an on-line ephemeris). Whats the problem?
This is almost certainly the result of using outdated orbital elements for the asteroid, comet, or spacecraft in question. Voyager 4.5 and SkyGazer 4.5 lets you automatically download and import the latest comet/asteroid/satellite orbit files from the Minor Planet Center and other sources; use the Updates command in the Voyager 4.5 or SkyGazer 4.5 menu (Mac OS X) or Help menu (Windows). Please note that your software must be registered in order to download data updates; unregistered versions have a fixed set of orbits that cannot be updated. Because of the gravitational perturbations of the other planets, the orbit of any object in the solar system is always changing. Therefore, a single set of orbital elements will gradually become less accurate over time. However, most asteroid and comet orbits change slowly enough that predictions based on a single orbit should be good to about an arcminute for several years, which ought to be sufficient for locating them in the sky. Artificial sate
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