In the daytime of August 21, four ACA antennas were driven synchronously for the first time at the Operations Support Facility (OSF). It was very impressive to see four antennas tracking a source accurately in synchronization, just like synchronized swimming in the Olympic Games. Finishing the operation, the antennas are left pointing to the same direction. In this long-exposure photograph, you can see the movement of stars over time. The center of the rotation (higher than the top edge of the photo) is the South Celestial Pole, which is not observable in Japan [picture and texts provided by George Kosugi].