If you have ever dipped a toe into the massive, culturally dominant world of Japanese fortune-telling, you have inevitably hit a wall of esoteric math. At the absolute center of that mathematics sits the Seimeisu (命星)—the Destiny Number. It is the unchangeable, foundational anchor of Rokusei Senjutsu. Unlike Western astrology, which looks up at the physical placement of celestial bodies at your time of birth, this system looks inward at the rigid, inescapable rhythms of the ancient Chinese calendar. It is not about the sky; it is about time.
To truly grasp what Six Star Astrology is, you must first understand that Kazuko Hosoki built her empire on the premise that human lives operate on a strict 12-year cyclical clock. Your Seimeisu is the exact numerical coordinate where your personal clock began ticking. It dictates your baseline personality, your fatal flaws, your compatibility with others, and the precise years your life will inevitably hit a wall—the infamous Daisakkai (Great Killing World).
There is no room for interpretation or intuition in finding this number. It is a cold, hard integer derived from a formula that has roots in the sexagenary cycle—a 60-term calendar system used in East Asia for millennia. By reducing your birth date to a single digit, the system strips away the illusion of total free will and replaces it with a predictable, cyclical roadmap.
The Mathematics of Fate: Calculating Your Star Number
Finding your Seimeisu is not a matter of simply knowing your birth month or looking up a zodiac sign. It requires a specific, three-step mathematical operation that reduces your entire existence into a single integer between 1 and 60. The calculation maps your modern Gregorian birth date back onto the ancient 60-point wheel of the Kanshi (the Ten Heavenly Stems and Twelve Earthly Branches).
First, you must consult a standardized fate table to find your base "Destiny Number" for your specific birth year and month. This number is pre-calculated based on the historical calendar shifts. Next, you apply the core formula: take that base number, subtract one, and add your birth day. Finally, if the resulting sum exceeds 60, you subtract 60. The remaining number is your definitive Seimeisu.
For example, let us say you check the tables and find your base number is 48, and you were born on the 20th of the month. Your raw score is 67 (which is 48 minus 1, plus 20). Because 67 is greater than the system's maximum, you subtract 60. Your definitive Seimeisu is 7. While you can easily calculate your destiny number using a digital tool to bypass the manual arithmetic, understanding the calculation reveals the system's underlying logic: every single day shifts the cosmic dial by exactly one notch. There are no cusps, no blurred lines, and no gray areas. You are either one number or the next.
The Six Star Types: Where Do You Fall?
Once you have your Seimeisu—a confirmed integer from 1 to 60—the system categorizes you into one of six planetary profiles. This categorization forms the absolute core of the system overview. It is crucial to note that these are not planets in the astronomical sense, but archetypal labels drawn loosely from the Five Elements (Wu Xing) and modified by Hosoki to fit modern psychological profiles.
The numerical mapping is absolute and divides the 60-number wheel into neat blocks of ten:
1 to 10: Saturn (土星人). The uncompromising idealists. Saturn types live entirely in their heads, driven by immense pride and a strict moral compass. They are brilliant creators and thinkers but often struggle with the messy, illogical realities of human relationships. They demand perfection from a world that rarely delivers it.
11 to 20: Venus (金星人). The restless trendsetters. Venus types are action-oriented, flashy, and eternally optimistic. They run from stagnation and thrive in fast-paced environments. However, their desperate need for constant motion means they often struggle with deep, long-term emotional commitments, preferring the spark of the new over the comfort of the familiar.
21 to 30: Mars (火星人). The mysterious mavericks. Deeply intuitive, fiercely independent, and notoriously difficult to read, Mars types project an aloof exterior that masks a desperate need for genuine connection. They operate on gut instinct rather than logic, making them unpredictable wildcards in both business and romance.
31 to 40: Uranus (天王星人). The emotional realists. Affectionate, stubborn, and deeply attached to family and lovers, Uranus types prioritize emotional security over cold logic. They are the ultimate pragmatists in matters of the heart, willing to forgive almost anything as long as their core emotional bonds remain intact.
41 to 50: Jupiter (木星人). The methodical planners. Quiet, enduring, and painfully cautious, Jupiter types build their lives brick by brick. They trust hard work over fleeting inspiration and view risk as an unnecessary evil. While they may lack the flash of a Venus type, their slow-burn approach almost always guarantees long-term stability.
51 to 60: Mercury (水星人). The independent financiers. Calculating, charismatic, and emotionally detached, Mercury types possess an unmatched instinct for wealth, survival, and self-preservation. They are natural entrepreneurs who can charm a room, but they often achieve their massive success at the cost of alienating their own families.
Polarity: The Plus and Minus of Your Zodiac
Knowing you are a Mars or Jupiter type is only half the equation. Every star type is split into two distinct polarities—Plus (+) and Minus (-)—which dictate whether you project your fundamental energy outward into the world or internalize it. Crucially, this polarity is not determined by your Seimeisu math, but by the Chinese Zodiac animal (Eto) of your birth year.
The rule is rooted in binary Yin and Yang philosophy. If you were born in a Yang year—specifically the Rat, Tiger, Dragon, Horse, Monkey, or Dog—you are assigned a Plus (+). You represent the extroverted, active, and aggressive expression of your star type. You act upon the world.
If you were born in a Yin year—the Ox, Rabbit, Snake, Sheep, Rooster, or Boar—you are assigned a Minus (-). You represent the introverted, passive, and often more psychologically complex iteration of your type. The world acts upon you, and you process it internally.
This polarity dramatically alters how a star type behaves in the real world. A Jupiter Plus is a bulldozer of productivity, aggressively organizing their life and everyone in it. A Jupiter Minus, however, is a quiet, immovable fortress—stubbornly resisting change from the inside. Furthermore, your polarity dictates the exact timing of your 12-year destiny cycle. Plus types and Minus types of the same star hit their respective peaks and their devastating Daisakkai (Great Killing World) in completely different years.
