12 min read·
Why Two BaZi Calculators Disagree About Your Chart
One birth moment, three different BaZi charts. See what the day boundary, year boundary and hour clock conventions move, and how to pin the one you want.
Hiroshi Kagawa
I-Ching Researcher & Chinese Metaphysics Writer
Japan
Hiroshi Kagawa has researched the I-Ching as a decision-making and divination framework for 25 years, and writes on the wider Chinese metaphysical system it belongs to: the Four Pillars of Destiny, the sexagenary cycle, and the lunisolar calendar and almanac tables that date selection is drawn from. His background in East Asian Philosophy informs his work on hexagram interpretation, day and hour boundary conventions, and dream symbolism in Buddhist and Taoist traditions. He is currently preparing a modern commentary on the I-Ching that ties classical hexagram readings to contemporary decision frameworks.
East Asian Philosophy background25 years of researchWriting a modern I-Ching commentary
I-ChingHexagram interpretationChinese astrologyBaZiFour Pillars of DestinyChinese almanacFeng shuiFlying starsKua numbersEast Asian metaphysicsTaoist philosophyDream analysisAngel numbers
36 articles published
Articles by Hiroshi Kagawa
11 min read·
Is There a Chinese Almanac API? Tong Shu Data Explained
Yes. A Chinese almanac API returns the Tong Shu day view as JSON: day officer, lunar mansion, clash animal, and an auspicious date search.
14 min read·
Feng Shui API Evaluation: 10 Checks Before You Build
Ten checks that separate a real flying star engine from a plausible one, each answerable from one request against any feng shui API in five minutes.
12 min read·
BaZi API for Developers: Four Pillars, Three Conventions
What a BaZi API must return, and how to reproduce a published Four Pillars chart: typed day, year and hour conventions echoed on every response.
10 min read·
Ship an I Ching Oracle App This Weekend with Zero Knowledge
Build and launch an I Ching oracle app in a weekend with AI coding tools and RoxyAPI. Hexagram casts, readings, and daily guidance from one API.
10 min read·
Human Design API: Type, Strategy and Authority Guide
A developer guide to the Human Design API: get type, strategy, and authority from one call, plus the full bodygraph from a birth date and time.
12 min read·
How Human Design Bodygraph Charts Work: Full Guide
A complete reference on the Human Design bodygraph: nine centers, 64 gates, 36 channels, definition, the two data sets, types, and authority.
22 min read·
Swiss Ephemeris Explained: Licensing, Precision, Alternatives
What the Swiss Ephemeris is, how it calculates planetary positions, and why its AGPL licensing decides most commercial astrology builds. A developer deep dive.
8 min read·
Biorhythm Critical Days: What Zero Crossings Mean
Biorhythm critical days occur when cycles cross zero. Learn about single, double, and triple critical day severity and how to track them with an API.
15 min read·
AI Agents Calling Real APIs: How Tool Calling and MCP Work in Practice
See how AI agents actually call APIs in production. Real examples of OpenAI function calling, Claude tool use, Gemini ADK, and MCP with request/response flows and code you can run today.
11 min read·
I-Ching API for Developers: Hexagrams and Book of Changes
Build I-Ching apps with a production hexagram API. 64 hexagrams, 384 changing lines, trigrams, three-coin casting, and daily oracle readings.
11 min read·
Dream Interpretation API: Build Apps with 2,500 Symbols
Build dream journal apps, AI dream chatbots, and wellness features with a structured dream symbol database API. 2,500+ symbols, 5 endpoints, JSON output.
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