Abstract: The present invention implements the movement of an object in an image projected onto a dome-shaped screen while maintaining an original resolution without increasing the resolution of a video projector as a projection device. In a device for projecting an image onto the dome-shaped screen D, an aggregate of two or more video projectors 1A, 1B for projecting a moving image is disposed in a dome such that the range of projection from the aggregate covers the whole sphere, and the aggregate is mounted on a stand 2 having two or more rotating shafts.

Abstract: The present invention implements the movement of an object in an image projected onto a dome-shaped screen while maintaining an original resolution without increasing the resolution of a video projector as a projection device. In a device for projecting an image onto the dome-shaped screen D, an aggregate of two or more video projectors 1A, 1B for projecting a moving image is disposed in a dome such that the range of projection from the aggregate covers the whole sphere, and the aggregate is mounted on a stand 2 having two or more rotating shafts.

Abstract: A fixed-star projection cylinder capable of reproducing a color unique to each fixed star for reproduction of situation of real starlit sky is provided. In a fixed-star projection cylinder for a planetarium to project fixed stars shown in a fixed-star template 2 as fixed-star images onto a screen, a spectral type is defined for each individual fixed star on the fixed-star template, and light emitted from a plurality of light sources 5 differing in color temperature or color tone are guided to corresponding individual fixed stars by light guiding means 4 such that the colors based on the defined spectral types can be reproduced in projection.