I can recommend watching the introductionary
video.
It is designed to give you only a specific answer to your query for information and not everything that contains your query. Refining the search does wonders. Of course it lacks a lot of information at this point (states of the UK, i.e.).
Indeed it does not give you a definition for orbital elements, but searching for orbit of ISS or orbit of GPS gives you very good results. "orbit of ISS vs. MIR" is also a very nice query to give it.
It really lacks internal hyperlinks, as shown by asking for chord. It doesn't surprise me that the search engine of the programmer of mathematica gives chord of a circle. But requesting musical chord will give an idea how to ask for specific musical chords.
Right now it is mainly giving out datasets and no general information, this will change with time though. For now the least thing it is good for is settle bets with the vs. function