PLANETARIUM

PURPOSE: To make it easy to understand visually the present position where oneself exists in a projected star field and relative position relations of the projected star field, asterisms, and celestial bodies in the outer space. CONSTITUTION: The planetarium is provided with a dome 31, a projector 7 to project the state of celestial bodies to the dome 31, an input means to give inputs of a first and a second visual points in the celestial bodies, first controlling means 3, 4 to control the projector 7 to project the state of the celestial bodies observed from the first visual point, image displaying apparatuses 10, 11 to display images of the state of the celestial bodies observed from the second visual point on at least either one of a part of the dome 31 and another screen 11a, and second controlling means 3, 5, 9 to control the image displaying apparatuses 10, 11 to display images of the state of the celestial bodies observed from the second visual point.