alchemy-of-28

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.

for more info see this page: geometric-months

for more info about other lunar cycles see this link: wiki/Month