Returns all Moon sign ingress events within a date range.

Moon Ingress Frequency: ~13 ingresses per month (Moon changes signs every ~2.5 days)

Performance: <5ms (cached), 50-100ms (cache miss)
Cache is pre-warmed for ±3 months on startup and refreshed daily at 00:01 UTC.

Cache Strategy:

• Tropical and sidereal ingresses cached separately (different times due to ~24° ayanamsa offset)
• Redis backend with 30-day TTL
• Rolling 3-month window maintained automatically
• Graceful fallback to live calculation if cache miss
• Startup health check reports cache status

Use Cases:

• Monthly lunar calendars
• "Best days for haircuts" timing apps
• Moon sign tracking applications
• Gardening/manifestation by Moon sign
• Electional astrology lookups

Rate Limiting: Max 90-day range per query to prevent abuse.

Example:

GET /ephemeris/moon/ingresses?start_date=2025-12-01T00:00:00Z&end_date=2025-12-31T23:59:59Z&zodiac_mode=tropical

{
  "count": 13,
  "ingresses": [
    {
      "from_sign": "Aries",
      "time": "2025-12-01T08:15:00+00:00",
      "to_sign": "Taurus"
    },
    {
      "from_sign": "Taurus",
      "time": "2025-12-03T18:30:00+00:00",
      "to_sign": "Gemini"
    }
  ],
  "metadata": {
    "average_ingresses_per_month": 13,
    "cache_hit": true,
    "calculation_time_ms": 2.1,
    "end_date": "2025-12-31T23:59:59+00:00",
    "start_date": "2025-12-01T00:00:00+00:00",
    "zodiac_mode": "tropical"
  },
  "success": true
}