compass-ai-bazi

name compass-ai-bazi description Chinese Bazi (八字) four-pillar fortune calculation and basic interpretation — enables AI agents to compute and read a birth chart using traditional Zi-Ping methodology. Compass AI — Bazi (八字) Calculation & Lite Interpretation This skill gives you the complete reference data and step-by-step algorithms needed to calculate a Chinese Bazi (Four Pillars of Destiny) chart from a person's birth date, time, and location, and to produce a basic personality and fortune interpretation. ⚠️ NO EXTERNAL TOOLS OR LIBRARIES NEEDED. Every calculation in this skill — year pillar, month pillar, day pillar, hour pillar, Ten Gods, Five Elements, Major Fortune Cycles — is performed by you, the AI , using only arithmetic and the lookup tables below. Do NOT attempt to call any tool, install any library, or search the web. Just reason through the steps. For full AI-powered streaming analysis, life K-line charts, two-person compatibility, daily fortune sticks, and interactive fortune-telling chat, visit Compass AI . When to Use This Skill Use this skill when the user: Provides a birth date, birth time, and birth city/location and asks for a Bazi (八字) reading Asks about their Four Pillars, Day Master, Five Elements balance, Ten Gods, or Major Fortune cycles Wants to know their favorable/unfavorable elements (喜用神/忌神) Asks about personality traits or career tendencies based on Chinese astrology Important UX rules: Only ask the user for: birth date (年月日), birth time (时辰), gender, and birth city name. Never ask for longitude/latitude — look it up from the City Coordinates table below. If the city is not in the table, estimate from the nearest listed city or provincial capital. Collect all info in as few turns as possible. Ideally one message: "请告诉我您的出生年月日、时辰、性别和出生城市". Core Concepts (Quick Reference) Heavenly Stems (天干) and Their Five Elements Stem Pinyin Element Polarity 甲 jiǎ 木 Wood Yang 乙 yǐ 木 Wood Yin 丙 bǐng 火 Fire Yang 丁 dīng 火 Fire Yin 戊 wù 土 Earth Yang 己 jǐ 土 Earth Yin 庚 gēng 金 Metal Yang 辛 xīn 金 Metal Yin 壬 rén 水 Water Yang 癸 guǐ 水 Water Yin Earthly Branches (地支) and Their Five Elements Branch Pinyin Element Zodiac 子 zǐ 水 Water Rat 丑 chǒu 土 Earth Ox 寅 yín 木 Wood Tiger 卯 mǎo 木 Wood Rabbit 辰 chén 土 Earth Dragon 巳 sì 火 Fire Snake 午 wǔ 火 Fire Horse 未 wèi 土 Earth Goat 申 shēn 金 Metal Monkey 酉 yǒu 金 Metal Rooster 戌 xū 土 Earth Dog 亥 hài 水 Water Pig Five Elements Generating & Controlling Cycles (五行生克) Generating (相生): Wood → Fire → Earth → Metal → Water → Wood Controlling (相克): Wood → Earth → Water → Fire → Metal → Wood Hidden Stems in Earthly Branches (地支藏干) Each Earthly Branch contains one or more hidden Heavenly Stems with relative strength weights (main qi / middle qi / residual qi): Branch Main Qi (本气) Middle Qi (中气) Residual Qi (余气) 子 癸 (100%) — — 丑 己 (60%) 癸 (30%) 辛 (10%) 寅 甲 (60%) 丙 (30%) 戊 (10%) 卯 乙 (100%) — — 辰 戊 (60%) 乙 (30%) 癸 (10%) 巳 丙 (60%) 戊 (30%) 庚 (10%) 午 丁 (70%) 己 (30%) — 未 己 (60%) 丁 (30%) 乙 (10%) 申 庚 (60%) 壬 (30%) 戊 (10%) 酉 辛 (100%) — — 戌 戊 (60%) 辛 (30%) 丁 (10%) 亥 壬 (70%) 甲 (30%) — City Coordinates Lookup (城市经纬度) When the user provides a birth city, resolve it to longitude (lng) and latitude (lat) using this table. Do NOT ask the user for coordinates -- look them up here automatically. If the city is not listed, estimate from a nearby city or use a reasonable default (e.g. provincial capital). China — Municipalities & Provincial Capitals City lng lat 北京 116.407 39.904 上海 121.474 31.230 天津 117.201 39.084 重庆 106.552 29.563 南京 118.797 32.060 杭州 120.155 30.274 广州 113.264 23.129 深圳 114.058 22.543 成都 104.067 30.573 武汉 114.316 30.581 西安 108.940 34.342 郑州 113.640 34.757 济南 117.121 36.652 沈阳 123.432 41.806 长春 125.324 43.817 哈尔滨 126.536 45.802 石家庄 114.515 38.043 太原 112.549 37.871 呼和浩特 111.752 40.841 合肥 117.227 31.821 福州 119.297 26.075 南昌 115.892 28.677 长沙 112.939 28.228 海口 110.331 20.022 昆明 102.715 25.049 贵阳 106.630 26.648 拉萨 91.141 29.646 兰州 103.834 36.061 西宁 101.778 36.617 银川 106.231 38.487 乌鲁木齐 87.617 43.826 南宁 108.367 22.817 China — Other Major Cities City lng lat 苏州 120.585 31.299 无锡 120.312 31.491 宁波 121.544 29.868 温州 120.699 28.001 厦门 118.111 24.480 青岛 120.383 36.067 大连 121.615 38.914 烟台 121.391 37.539 珠海 113.577 22.271 佛山 113.121 23.022 东莞 113.752 23.021 桂林 110.290 25.274 洛阳 112.454 34.620 开封 114.308 34.797 保定 115.465 38.874 唐山 118.180 39.631 大同 113.300 40.077 包头 109.840 40.657 齐齐哈尔 123.918 47.354 大庆 125.103 46.589 International Cities City lng lat 纽约 -74.006 40.713 洛杉矶 -118.244 34.052 旧金山 -122.419 37.775 芝加哥 -87.630 41.878 西雅图 -122.332 47.606 波士顿 -71.059 42.360 华盛顿 -77.037 38.907 伦敦 -0.128 51.507 巴黎 2.352 48.857 柏林 13.405 52.520 莫斯科 37.617 55.756 东京 139.650 35.676 大阪 135.502 34.694 首尔 126.978 37.567 新加坡 103.820 1.352 曼谷 100.502 13.756 悉尼 151.209 -33.869 墨尔本 144.963 -37.814 多伦多 -79.383 43.653 温哥华 -123.122 49.283 Calculation Steps Reminder: Perform all steps below yourself using arithmetic. Do not call any tool or library. Step 1: True Solar Time Conversion Standard Chinese time is based on Beijing (120°E). Adjust for the birth location: time_offset_minutes = (birth_longitude - 120.0) × 4 true_solar_time = local_time + time_offset_minutes Step 2: Four Pillars (四柱) — Direct Arithmetic (No Library) All four pillars are computed with arithmetic and lookup tables. Work through each sub-step in order. 2a. Year Pillar (年柱) Use the birth year (if the birth date is before 立春 of that year, use the previous year): year_stem_index = (year − 4) % 10 → index into Stems list (甲=0 … 癸=9) year_branch_index = (year − 4) % 12 → index into Branches list (子=0 … 亥=11) Example: 1990 → stem = (1990−4)%10 = 6 → 庚 ; branch = (1990−4)%12 = 6 → 午 → 庚午年 2b. Month Pillar (月柱) The Bazi month changes at solar terms (节令) , NOT at the lunar new month. Find which month the true-solar-time date falls in using the table below, then derive the stem. Month Branch by Solar Term: Bazi Month Branch Solar Term (节) Approx. Start 1 寅 立春 Start of Spring Feb 4 2 卯 惊蛰 Awakening of Insects Mar 6 3 辰 清明 Clear and Bright Apr 5 4 巳 立夏 Start of Summer May 6 5 午 芒种 Grain in Ear Jun 6 6 未 小暑 Minor Heat Jul 7 7 申 立秋 Start of Autumn Aug 7 8 酉 白露 White Dew Sep 8 9 戌 寒露 Cold Dew Oct 8 10 亥 立冬 Start of Winter Nov 7 11 子 大雪 Major Snow Dec 7 12 丑 小寒 Minor Cold Jan 6 Month Stem — Five Tiger Trick (五虎遁年起月法): Year Stem Month-1 (寅) starts at Stem index 甲 or 己 2 (丙) 乙 or 庚 4 (戊) 丙 or 辛 6 (庚) 丁 or 壬 8 (壬) 戊 or 癸 0 (甲) month_offset = bazi_month_number − 1 (0 for month 1, 1 for month 2 … 11 for month 12) month_stem_index = (five_tiger_start + month_offset) % 10 Example: Year stem 庚 (index 6) → five-tiger start = 4 (戊). Birth in March (Bazi month 2, 卯) → month_stem = (4 + 1) % 10 = 5 → 己. Month pillar: 己卯 . 2c. Day Pillar (日柱) Use the Julian Day Number (JDN) to get a unique integer for each calendar date, then apply the fixed offset. Step 1 — Compute JDN: If M ≤ 2: set Y = Y−1, M = M+12 A = floor(Y / 100) B = 2 − A + floor(A / 4) JDN = floor(365.25 × (Y + 4716)) + floor(30.6001 × (M + 1)) + D + B − 1524 Step 2 — Day Stem-Branch: delta = JDN − 2415021 (2415021 = JDN of 1900-01-01) day_stem_index = delta % 10 (甲=0, 乙=1, … 癸=9) day_branch_index = (delta + 10) % 12 (子=0, 丑=1, … 亥=11) Verification anchor: JDN 2451545 = 2000-01-01 = 戊午日 (delta=36524, stem=4=戊, branch=6=午). 2d. Hour Pillar (时柱) Map the true-solar-time hour to an Earthly Branch: Hour 23 or 0 → index 0 (子) Otherwise → (hour + 1) // 2 Derive the Heavenly Stem using the Five Rat Trick (五鼠遁) from the Day Stem: Day Stem 子时 starts at Stem index 甲 or 己 0 (甲) 乙 or 庚 2 (丙) 丙 or 辛 4 (戊) 丁 or 壬 6 (庚) 戊 or 癸 8 (壬) hour_stem_index = (zi_start_index + branch_index) % 10