The graph gives also the days of apogee (capital A), and those of perigee (P). And also the days of new moon, and the days of full moon.
In the course of each cycle, the sidereal month, of about 27,3 days, usually there are four changes of angular velocity, called <a, b, c, d>.
The regularity of the series <a, b, c, d>, of the cycle, presents several exceptions; that may occur during the years when the range of the moon declination is reduced (< +/-20°).
If in the graphs of the cycle there are blue coloured bars, they indicate the point where seeds, still on soil, switch phase (cumulative to dissipative, or viceversa).
Code names of the points of the variation of the moon angular velocity.
In the normal seed viability cycle, of the sideral month, complete of all the four points of velocity change, there is a point a when the moon declination is near zero, going towards north values.
There is a point b when the velocity of the moon phase begins to decrease, the moon declination presenting north values.
There is a point c when the moon declination is near zero, going towards south values.
There is a point d when the velocity of the moon phase begins to decrease, the moon declination presenting south values.