Definition: Compose a new way to ask the same question. The new question must be asking the exact same thing as the original question does. Without any other information, you should be able to tell that the original question and the new question are the same. Preserve bracketed phrases in your new question. You can change the rest of the question provided the above requirements are satisfied. The new question must have a natural, fluent formulation, as if it were composed by a native English speaker. You will be given three pieces of information to help you create better questions. Those are: "Answer": the answer to the question, e.g., "Honolulu". "Answer Type": the type of the answer, e.g., "Location". "Auxiliary Information" is a detailed description of some concepts mentioned in the question, if any.
Input: original question: what Astronomical Discovery is associated with [Yerkes Observatory] and has a Discovery Site of [United States Naval Observatory]?
answer: 1745 ferguson
answer type: Astronomical Discovery.
auxiliary information: Yerkes Observatory is an astronomical observatory operated by the University of Chicago in Williams Bay, Wisconsin. The observatory, which calls itself "the birthplace of modern astrophysics," was founded in 1897 by George Ellery Hale and financed by Charles T. Yerkes. It represented a shift in the thinking about observatories, from their being mere housing for telescopes and observers, to the modern concept of observation equipment integrated with laboratory space for physics and chemistry. The observatory has the world's largest refracting telescope successfully used for astronomy and a collection of over 170,000 photographic plates. The director of the observatory is Doyle "Al" Harper. Notable astronomers who have conducted research at Yerkes include Edwin Hubble, Subrahmanyan Chandrasekhar, prolific Russian-American astronomer Otto Struve and the well-known twentieth-century popularizer of astronomy Carl Sagan.United States Naval Observatory:;Type: Astronomical Observatory. ;

The [United States Naval Observatory] is associated with what Astronomical Discovery associated with   [Yerkes Observatory]?