The Math Behind Cross-Referencing 4 Divination Systems

I built an AI fortune telling website that cross-references 4 divination systems. Here is the actual logic behind the cross-referencing algorithm.

The 4 Systems

1. Western Astrology - Sun sign based on birth date
2. Chinese BaZi (Four Pillars) - Heavenly Stems + Earthly Branches from birth date/time
3. Tarot - Random card draw with question context
4. Numerology - Life Path Number from birth date digits

Why Cross-Reference?

Each system has blind spots:

• Astrology: Too generalized (only 12 signs)
• BaZi: Needs exact birth time
• Tarot: Random, different every time
• Numerology: Only uses birth date, ignores time

When multiple systems agree on a trait, the confidence increases.

The Algorithm

function crossReference(astrology, bazi, tarot, numerology) {
  const themes = {};

  // Extract themes from each system
  const astroThemes = extractThemes(astrology);  // e.g., ["leadership", "fire", "action"]
  const baziThemes = extractThemes(bazi);         // e.g., ["strong fire", "direct"]
  const tarotThemes = extractThemes(tarot);       // e.g., ["initiative", "courage"]
  const numThemes = extractThemes(numerology);    // e.g., ["independence", "pioneer"]

  // Count occurrences across systems
  [...astroThemes, ...baziThemes, ...tarotThemes, ...numThemes]
    .forEach(theme => {
      themes[theme] = (themes[theme] || 0) + 1;
    });

  // Themes appearing in 3+ systems = high confidence
  // Themes appearing in 2 systems = medium confidence
  // Themes in 1 system = supplementary insight
  return Object.entries(themes)
    .sort((a, b) => b[1] - a[1])
    .map(([theme, count]) => ({
      theme,
      confidence: count >= 3 ? 'high' : count >= 2 ? 'medium' : 'low',
      sources: getSources(theme)
    }));
}

Example Output

For someone born March 15, 1990:

Theme	Astrology	BaZi	Tarot	Numerology	Confidence
Leadership	Pisces (debatable)	Strong Fire	The Emperor (4)	Life Path 1	HIGH
Creativity	Pisces ✓	Wood element	The Magician (1)	Life Path 1	HIGH
Emotional depth	Water sign ✓	Water in chart	The Moon (18)	Not present	MEDIUM

The cross-referencing makes the reading more personalized than any single system alone.

Try it yourself →