Dome movies, also known as dome movies and dome movies, also originated from military applications. During World War II, some countries projected the image of enemy aircraft on the spherical screen for air defense training. In the 1970s, it developed into a full dome shape. The screen was spherical, and the audience was surrounded by it, and the screen looked like a sky. The dome theater uses a hemispherical screen with a diameter of 3 to 20 meters, presenting a large screen area. The audience’s field of vision is full of super-large images, coupled with fish-eye motion shooting, the audience experience the extreme shock and dizziness brought by the turning of the sky and the earth and the shaking of the mountains as if it were real. Why do dome movies have a strong visual impact? In addition to the huge dome-shaped screen and wavy ring projection technology used in dome-screen movies, the most important actual shooting and projection process uses a special ultra-wide-angle lens called a fisheye lens. A fisheye lens is quite similar to a fish’s eye, with a large visual range, good perspective effect, and long depth of field. The image projected by this lens covers the entire screen, with shocking appeal and visual impact. Of course, some movies are now played through conversion, that is, the original movie was shot normally, and then converted into a dome screen through the device. The seat slope of the dome theater is adjustable, and the inclination of the seat back varies with the front and rear positions, creating an environment suitable for the audience to look up at the sky. You will feel that you are not watching a movie, but exploring the sea in a submarine and flying a spaceship... In addition to the ball screen movie, the dome theater can also demonstrate astronomical programs. Among them, the astronomical demonstration system combines an optical planetarium with a digital auxiliary projection system, which not only popularizes astronomical knowledge, but also increases the viewing ability of the program, allowing the audience to appreciate the vast universe while also learning scientific knowledge and lamenting the wonder of the universe. An optical planetarium can project stars onto a hemispherical screen to form an artificial starry sky. It also demonstrates the movement of the sun, moon and planets through a tight gear transmission system, plus some special effect projectors, which can perform colorful astronomical phenomena. The optical planetarium of the China Science and Technology Museum consists of a stellar projector and a solar system ladder projector. The stellar projector can project the starry sky, the Milky Way and some deep sky objects; the solar system celestial projectors project the sun, Mercury, Venus, Earth, Mars, and Saturn respectively , Jupiter and the Moon. The digital auxiliary projection system is projected by 6 video projectors, and then stitched together to form a complete picture to fill the hemispherical screen. The digital auxiliary projection system can also demonstrate the starry sky images generated by the computer in real time, such as precession, the three-dimensional displacement of the starry sky, etc. It can reveal the mysteries of the universe with more realistic starry sky and more powerful scenes. The dome theater of the China Science and Technology Museum combines a monotonous but precise optical planetarium with a vivid and rich digital auxiliary projection system, which can be used for astronomy teaching and research.
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