I spent the weekend in a workshop studying astrological lunations. Lunations are roughly 29-year cycles divided into 8 phases (like the 8 phases of the moon) of 3+ years. An individual's cycles depend on what phase of the moon s/he's born under and the progression each year of the natal sun and moon (the natal sun progressing about 1 degree per year and the natal moon progressing about 1 degree per month); where sun and moon come together on the same degree of the zodiac, that's the new moon.
For example, I was born under a last quarter moon in 1970; my first new moon occurred right after I turned six, in 1976. My second new moon occurred in 2005, and I'm nearing the end of that phase, moving into a crescent moon phase early next year. Each 3+ year phase has a different energy, so it's interesting and useful to track the events of one's life via the moon cycles in order to reach a better understanding of what was happening when and why.
In short, studying lunations is one way to study the energetic cycles in a life and to get a "big-picture," relatively impersonal view of the events in that life. The Sabian symbol for each new moon is like a book title describing the 29-30 years covered by that volume of one's life. The first volume of my life was marked by Pisces 17; title: "An Easter Promenade." There I see the symbolism of traditional religion, of crucifixion and resurrection, and of stately walking in one's best apparel. The title of the current volume is Aries 16: "Browning dancing in the twilight." I love the magical feeling of this symbol, the picture of the elementals dancing in liminal space.
I began the mystery school and this blog is 2005, with the dawning of my dark moon.