The sky dome's two domes, as seen from below.
This image shows the sky dome's octagonal raised floor; the diaphragm that holds the base plates carrying outer dome; the base of the inner, translucent dome; and the rotating square base of the heliodon.
Seen here are the sky dome's three components: the outer dome, where 341 lamps will be mounted; the inner dome, which is translucent; and the heliodon arc, which adjusts the position of the sun.
