The primary purpose of the establishment of the astronomical museum was to inform people of the exact time, which is why time ball is the most important building. Of course, it also has the function of studying astronomy and celestial bodies. The time ball rises to its highest level before 1 p.m. and falls to show the time. The high ground of the Astronomical Museum is a good place to view the Sydney Habor Bridge and the first-line harbour panorama. These are the scenes that make the current astronomical museum open to the public to hold birthday parties and wedding.