Centre-to-centre distance
Centre-to-centre distance is a concept for distances, also called on-center spacing, heart distance, and pitch.
It is the distance between the centre of a column and the centre of another column. By expressing a distance in c.t.c., one can measure distances between columns with different diameters without confusion. This concept applies to other architectural features that may have variable diameters/widths and spacings, such as pillars or ceiling beams and baffles.
