PLANETARIUM

PURPOSE: To make it possible to try the content of the performance ahead of the manual performance presently carried out without disordering practical projected states. CONSTITUTION: The planetarium is provided with a projector 9 to project celestial bodies to a dome 21, an operation controlling means 5 to control the operation of the projector 9, input means 1, 2 to make inputs of the information to regulate the projection state by the projector 9, a calculating means 4 to calculate the projection state corresponding to the information of the input means 1, 2, a circuit line 111 to transmit the result of calculation to a driving means 8, a switch SW 7 to open or shut the circuit line 111, and a display 3 to carry out a display corresponding to the result of calculation at least in a state in which the circuit line 111 is parted.