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Alchemy of 28
In the graphic below I have calculated the average of the following 3 lunar cycles:
Synodic cycle = 29.5 days (visible cycle of the moon) Sidereal cycle = 27.3 days (orbital cycle of the moon) Draconic cycle = 27.2 days (nodical cycle of the moon) *rounded to 1 decimal place
When their lengths are added and divided to find the average the result is 28. 29.5 + 27.3 + 27.2 = 84 84 ÷ 3 = 28
In my research this length of time is called a geometric month, as it an alchemy of lunar cycles within a tetrahedral geometry (see graphic below).
3 cycles added and divided by 3, to create the average, the 4th point of the tetrahedron.
© 2000 Raah Sirus
for more info see this page: geometricmonths
for more info about other lunar cycles see this link: wiki/Month
