Major Cycles, known as Da Yun, divide your life into approximately 10-year phases. Each phase carries distinct elemental or stellar energy that overlays your natal chart. Both BaZi and Ziwei Doushu use Major Cycles as a primary timing tool, revealing when favorable or challenging periods will occur throughout your lifetime. This makes them a key part of long-term life planning.
In BaZi, each Major Cycle is defined by a Heavenly Stem and Earthly Branch pair derived from your birth month. The cycle's Five Element energy interacts with your natal chart, creating a new elemental environment for that decade. A favorable Major Cycle brings supportive elements to your Day Master. An unfavorable one introduces difficult elements that require adaptation and caution.
In Ziwei Doushu, Major Cycles shift the focus to different palace groups. New star configurations and a fresh set of Four Transformations activate for each decade. The decadal Self Palace, Career Palace, and Wealth Palace each receive new stars and transformations that redefine the theme of that life phase.
The starting age of your first Major Cycle varies. It can begin anywhere from birth to age 9, depending on your birth date, gender, and the relationship between your birth month and the surrounding solar terms. This calculation uses the solar calendar and is one of the first steps in a BaZi reading. An early onset means you enter active cycles sooner. A later onset means your formative years are governed more by natal chart energy alone.
A practitioner reads your life story through the sequence of Major Cycles: which decades bring career momentum, which bring relationship shifts, and when caution is needed. The Ten Gods that dominate each cycle reveal its theme. A Wealth-dominated decade favors financial pursuits, while an Authority-dominated decade shapes career advancement. Combined with Annual Fortune, Major Cycles provide a layered timing system with both decade-level strategy and year-level precision.
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Try the Free BaZi CalculatorThe concept is similar: both divide life into roughly 10-year phases. However, BaZi Major Cycles are defined by Stem-Branch pairs that introduce new elemental energy, while Ziwei Doushu cycles shift palace configurations and star activations. Fortune Cloud analyzes both for cross-validation.
A challenging Major Cycle cannot be avoided, but its impact can be mitigated. Understanding which elements are unfavorable allows you to choose supportive environments and time major decisions carefully. You can also strengthen weak areas proactively rather than being caught off guard.
Each Major Cycle lasts approximately 10 years. Fortune Cloud analyzes Major Cycles through age 90, giving you a comprehensive view of the elemental climate across each decade of your life.
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