Diatonic Scale Definition
A Diatonic scale is a scale that consists of 5 whole steps and 2 half step intervals. The half steps are typically 2 or 3 whole steps apart from each other. Wikipedia says, "The seven pitches of any diatonic scale can be obtained by using a chain of six perfect fifths. For instance, The seven natural pitches that form the C-Major scale can be obtained from a stack of perfect fifths starting from F: F -C-G-D-A-E-B." I suspect, but haven't validated, that this is a truism when applied as Wiki suggests.