"Nidaros Cathedral, Trondheim: the rose window. my ancestors built this church. It is the state church and coronation church of Norway. I've spent hundreds of hours sitting quietly in this beautiful cathedral I love rose windows.
The various types of basic rose windows are given here as a geometrical division of a large circle with three, four, five or six inner circles. The construction of the midpoints (M) is indicated, according to NETZ