Tibetan Astrology (藏曆占星)

Elemental Astrology of the Snow Land — Animal, Element, Mewa and the Five Forces of Life

Overview

Tibetan elemental astrology — nag-rtsi, the 'black calculation' — is the personal, fortune-telling branch of Tibet's astrological tradition, distinct from the astronomical 'white calculation' (kar-rtsi) used to build the calendar and from the Indian-derived horoscopy of the Kalachakra. Drawing on a Chinese-derived framework of twelve animals and five elements, it reads a life from the year of birth: your animal sign and its element place you in a sixty-year cycle, a magic-square number called the Mewa (sme ba) colours your character, a trigram called the Parkha (spar kha) marks your relationship to the eight directions, and five vital forces — life, body, power, soul and windhorse — measure your fortune year by year. It is the everyday astrology a Tibetan family would consult for a birth, a marriage, a journey or a funeral, and the layer a lama or astrologer (rtsis-pa) reads to advise on which years call for caution and which for action.

Origin & history

Tibetan astrology is a confluence of three streams. The indigenous Bön tradition contributed elemental and earth-spirit lore; from China came the twelve-animal cycle, the five elements (Wood, Fire, Earth, Iron/Metal and Water), the nine magic-square numbers (Mewa) and the eight trigrams (Parkha) of the Yijing; and from India came the Kalachakra Tantra's planetary astronomy in the 11th century. The animal-and-element 'black calculation' framework used here, the 'jung-tsi (byung-rtsi, 'elemental calculation'), is the Chinese-derived layer, said in legend to have been brought to Tibet by the Chinese princess Wengcheng Kongjo, who married King Songtsen Gampo in the 7th century. The system was codified over the following centuries and is preserved today chiefly by the Men-Tsee-Khang (the Tibetan Medical and Astrological Institute) in Dharamsala, founded in 1961, whose astrologers still cast the annual almanac (lo-tho) by these rules.

The sixty-year cycle of element-animal combinations was formally adopted in Tibet in 1027 CE, the start of the first rabjung (sexagenary cycle), timed to the introduction of the Kalachakra teachings — which is why Tibetan cycle-counting begins from a Fire-Hare year. For day-to-day calculation, however, the animal and element of a given year align with the Chinese sexagenary reckoning, so the practical anchor used in computation is the modern alignment in which 1984 is a male Wood-Mouse year. Over the centuries the elemental astrology branched into specialised calculations: nag-rtsi for personal life-forces and yearly fortune, the dur-rtsi 'death calculations' performed at funerals, the bag-rtsis marriage-compatibility analysis, and the prognostics woven into the printed almanac. The tradition survived the upheavals of the 20th century through the re-establishment of the Men-Tsee-Khang in exile, and its astrologers continue to train in both the elemental ('black') and astronomical ('white') systems.

How it works

askTIAN computes the personal nag-rtsi layer deterministically from your birth date and gender. The birth year fixes your animal sign and its sixty-cycle element (anchored at 1984 = Wood-Mouse) and its yin/yang polarity. From these it derives the five personal forces: srog (life-force) from the animal's own fixed element; wangthang (dbang-thang, capacity/power) from the year element; la (bla, soul) as the element that 'mothers' the life-force; lü (lus, body) from a lookup on the animal's body-key element; and lungta (rlung-rta, windhorse/luck), which is lineage-variable and so reported with low confidence and kept out of the score. It calculates your Mewa — one of nine magic-square numbers on a descending cycle anchored at 1864 = 1-White — with its colour, element and lineage 'mirror' title, and your Parkha trigram. Because the authentic fixed natal Parkha is matrilineal (it needs the mother's year), the engine instead returns the genuine age-based progressed Parkha (babs spar) for the forecast year, clearly labelled as a yearly value rather than a fixed sign. Finally it reads the forecast year's element against each of your forces through the mother/son/friend/enemy (ma/bu/grogs/dgra) relationships to produce an annual outlook and a transparent 0–100 favorability score. Births in the December–February window are flagged, since the animal-year boundary can shift by one depending on whether a lineage starts the year at the winter solstice or at Losar.

Good for

Use cases

Tibetan Birth-Sign Profile

Send a birth date and gender; the API returns the animal sign and its fixed element, the sixty-cycle year element and polarity, the Mewa number with its colour, element and 'mirror' title, and the progressed Parkha trigram with its direction and meaning — everything an app needs to render a complete Tibetan natal card.

Annual Fortune Forecast

Pass a forecastYear and the engine reads that year's element against each of the five personal forces through the mother/son/friend/enemy relationships, returning a per-force outlook (nourished, supported, stable, drained or attacked) and a 0–100 favorability score — ideal for a yearly horoscope or Losar New-Year feature.

Life-Force Health & Vitality Layer

The srog (life), lü (body) and la (soul) forces, each carrying a confidence label, let a wellbeing product surface which years stress vitality versus support it — framed as reflective guidance, never as medical advice.

Cross-Tradition Comparison

Because Tibetan elemental astrology shares the twelve animals and five elements with Chinese BaZi but assigns them differently, apps can show users how their Tibetan sign and forces compare with their Chinese pillars and Western chart, enriching a multi-system profile.

Key terms

Nag-rtsi vs kar-rtsi
Nag-rtsi (the 'black calculation') is the Chinese-derived elemental astrology of animals, elements, Mewa and Parkha used for personal fortune; kar-rtsi (the 'white calculation') is the Indian-derived astronomical astrology used to compute the calendar and planetary positions. This engine implements the personal nag-rtsi layer.
Animal & element
Each year carries one of twelve animals (Mouse, Ox, Tiger, Hare, Dragon, Snake, Horse, Sheep, Monkey, Bird, Dog, Pig) and one of five elements (Wood, Fire, Earth, Iron, Water), combining over a sixty-year cycle. Note the animal also has its own fixed element, which can differ from the year element.
Mewa (sme ba)
One of nine numbers (1–9) arranged in a magic square, each with a colour (white, red, green, yellow, blue/indigo, maroon, black) and an element. The Mewa cycles backward one number per year and colours a person's character and karmic tone; it is read both at birth and as a yearly transit.
Parkha (spar kha)
One of eight trigrams from the Yijing (Li, Khon, Da, Khen, Kham, Gin, Zin, Zon), each linked to an element, a direction, a family member and a part of the body. The fixed natal Parkha is matrilineal; the progressed Parkha changes with age and is what this engine reports for the forecast year.
The five forces
Srog (life-force), lü/lus (body and health), wangthang (dbang-thang, capacity and power/fortune), la/bla (soul or spirit) and lungta (rlung-rta, windhorse or luck/momentum). Each is an element; their condition in a given year is the core of the annual reading.
Ma / bu / grogs / dgra
The four elemental relationships used throughout: ma (mother, the element that generates yours), bu (son, the one yours generates), grogs (friend, supportive), and dgra (enemy, destructive). A transit that is the 'mother' of a force nourishes it; an 'enemy' weakens it.
Lungta (windhorse)
The 'wind horse', the force of luck, vitality and momentum that carries one's fortunes — also the figure on Tibetan prayer flags. Its exact derivation varies between lineages, so askTIAN reports it with low confidence and excludes it from the favorability score, in the interest of honesty.
Losar boundary
Losar is the Tibetan lunar New Year (around February). Because some lineages start the astrological year at the winter solstice and others at Losar, the animal-year of a person born in December–February can differ by one; the engine flags such births so the value can be verified against an almanac.

API

The askTIAN Tibetan Astrology API computes the personal nag-rtsi ('black calculation') layer from a birth date and gender: the animal sign and its fixed element, the sixty-cycle year element and yin/yang polarity (anchored at 1984 = Wood-Mouse), the Mewa magic-square number with its colour, element and 'mirror' title, the progressed Parkha trigram (labelled as a yearly value, since the true natal Parkha is matrilineal), and the five personal forces — srog, lü, wangthang, la and lungta — each with a confidence label. It then reads the forecast year's element against every force through the mother/son/friend/enemy relationships to return an annual outlook, a Losar-boundary honesty flag for winter births, a transparent 0–100 favorability score and a fixed-section LLM reading. A symbolic tradition offered for reflection, not a validated predictor, and not medical or financial advice. Set interpretation:false for structured data only.

Endpoint: POST /trpc/tibetan.astrology — 6 TIAN Points. See the API documentation and Playground.