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The seats point in one preferred direction of projection (south/north). The planetarium projector should feature a vertical axis for azimuth rotation to permit changing of the horizontal directions.
Advantages: identical alignment of the other projection media. Stereo and surround sound can be used. Small stage in the audience's direction of view.
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| Unidirectional seating |
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| Unidirectional, stepped seating |
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Unidirectional seating with rows of seats rising from the center toward the edge of the dome. Improved viewing conditions.
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| Unidirectional stepped seating |
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