Our ancestors knew this knowledge and have divided a year into 13 months

There are 13 constellations, 13 moon cycles in a year & 27-29 days per cycle.

All ancient civilizations used this calendar, which followed a natural order of nature and cosmos, and was immensely more intune with our body's biorhythm.

You can imagine why parasites changed it, and subtracted one month in order to sever the connection between the people and the sun, moon & other celestial bodies, which all have huge energetical influence on our wellbeing.