The interior of the planetarium is a hemisphere with the star projector in the geometrical center. The control desk of the presenter is normally at the Northern edge. The alignment of the seats can be divided into two architectures:

concentrical: The seat rows are aligned in circles around the central projector, and the verge of the dome represents the visible horizon of the sky. For astronomical shows this configuration is best, because the visitors watch equally to any direction. There is no preferential sight. The 360°-projection is fully exploited.

uni-directional: The rows form arcs of the circle whose center is different from the hall's. Thus, one segment of a circle is established with a preferential direction. The significant occurences would take place in a certain area in front. All visitors will have almost the same conditions of sight.

Possible other alignments exist (hyperbolical or semi-concentrical rows), however, they are not very common. Both, the concentrical and the uni-directional shape, are subject to discussion about advantages and disadvantages. The opinions for the "most appropriate" model are based on the different intentions for a deployment of the star hall. In either case, the auditorium can have a tilt, most likely it is found for the uni-directional model.