The Liverpool Telescope (LT) is a two-metre-aperture robotic Ritchey–Chrétien telescope that observes autonomously. However professional astronomers, school groups and other credible registered users submit specifications to be considered by its robotic control system (RCS) at any time using an online graphical user interface. Each night the RCS decides among these choices, and among any notified or glimpsed transient events, what to observe, based on target visibility and weather conditions.