The JPL HORIZONS system is amazing! You can compute the position of anything in the Solar System, at any time. With Weichi Yao (NYU) and others, I have been looking at Halley's Comet, with the thought of making a machine-learning benchmark data set (this is an idea from Soledad Villar, JHU). When we look up Halley in HORIZONS, we find many Halleys, not just one. I hypothesized that this is because there are different solutions for Halley on different apparitions. But somehow I am sort-of wrong: That's true for most of the Halleys in the system. But then today in our meeting Yao showed that there's one that seems to do well at all epochs. Huh? Anyway, HORIZONS is better on content than documentation!
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