Follicular and luteal phase lengths. â variability of menstrual cycle. attributable to follicular phase. â  Mean cycle length ranges from 27.3 to 30.1 days between ages 20 and 40 years, follicular. phase length is 13-15 days, and luteal phase length is less variable and averages. 13-14 days1-3.
Any sequence of seven successive natural notes, such as C-D-E-F-G-A-B, and any transposition thereof, is a diatonic scale. Piano keyboards are designed to play natural notes, and hence diatonic scales, with their white keys. A diatonic scale can be also described as two tetrachords separated by a whole tone.
and 2 half steps, where the half steps have the maximum separation usually 2 or 3. notes apart. In this paper we will simply consider the major scale, which is one of the diatonic. scales. De nition 1.3. The major scale is a diatonic scale with the pattern of whole step, whole, half, whole, whole, whole, and half. In this paper will also use the notions of interval and triad. Date: AUGUST 21, 2009.