first lets redefine your symbol definitions:
1) a crescend moon
2) a crescend moon with an added dot in its center
3) a sun (a solid circle with 6 rays)
4) an open circle (like the letter O)
5) a rectangular shape with one open side
6) a line with a shorter line perpendicular to one side and two diagonal ones on the other side ( basically: "-K" )
the first part of the puzzle:
spoiler:the each rotating disk in the room has two 'windows' to select symbols, the first puzzle is about setting the correct symbols in the outer windows
in the six rooms bordering the large center crypt, the symbols can be found carved in the floor. The discs need to be set so that the symbols have the exact same order and orientation as in the six rooms:
when you look at you map:
(5) (3) (4)
*
(6) (2) (1)
* = entrance to the room
second part of the puzzle:
spoiler:now the outer 'windows' are aligned with the floors of the six rooms, the inner 'windows' indicate the symbol to place on the cylindrical pedestals on top the outside of the mechnism. (the game does hint that these pedestals are to be used, by using them as the center of rotation during the ghost's explanation, but admittedly I only noticed this after I solved the puzzle and replayed the explanation)
tip after solving the puzzle:
spoiler:after you've solved the puzzle there's a hidden passage to ...