These are determined in advance and if you know these you can gain some control. Leads to biorythm charts, guidebooks, clocks, computer programs, etc. Original idea came from associates of Freud at turn of century. Mother's cycle determines day of birth and sex of child. Cycles start together at birth and continue for rest of life.
Cycles determine onset of illness and date of death.
This is one example of a wide variety of authors of books who attempt to explain prehistory or myths. Here the basic question concerns the Bible. You have stories of flood, manna from heaven, sun standing still, etc. Stories are common to other cultures. Publisher turned book over to competitor and fired editor.