diff --git a/backend/app/services/__init__.py b/backend/app/services/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/backend/app/services/lunar.py b/backend/app/services/lunar.py
new file mode 100644
index 0000000..4776cee
--- /dev/null
+++ b/backend/app/services/lunar.py
@@ -0,0 +1,144 @@
+from __future__ import annotations
+from dataclasses import dataclass, asdict
+from datetime import date, datetime, timedelta
+import math
+from pathlib import Path
+import pytz
+from skyfield.api import load
+from skyfield import almanac
+
+TZ = pytz.timezone("Europe/Paris")
+SIGN_NAMES = [
+    "Bélier", "Taureau", "Gémeaux", "Cancer", "Lion", "Vierge",
+    "Balance", "Scorpion", "Sagittaire", "Capricorne", "Verseau", "Poissons",
+]
+SIGN_TO_TYPE = {
+    "Taureau": "Racine", "Vierge": "Racine", "Capricorne": "Racine",
+    "Cancer": "Feuille", "Scorpion": "Feuille", "Poissons": "Feuille",
+    "Gémeaux": "Fleur", "Balance": "Fleur", "Verseau": "Fleur",
+    "Bélier": "Fruit", "Lion": "Fruit", "Sagittaire": "Fruit",
+}
+
+
+@dataclass
+class DayInfo:
+    date: str
+    phase: str
+    illumination: float
+    croissante_decroissante: str
+    montante_descendante: str
+    signe: str
+    type_jour: str
+    perigee: bool
+    apogee: bool
+    noeud_lunaire: bool
+
+
+def zodiac_sign_from_lon(lon_deg: float) -> str:
+    return SIGN_NAMES[int(lon_deg // 30) % 12]
+
+
+def _local_noon(d: date) -> datetime:
+    return TZ.localize(datetime(d.year, d.month, d.day, 12, 0, 0))
+
+
+def _compute_perigee_apogee_days(
+    ts, earth, moon, start: date, end: date
+) -> tuple[set[date], set[date]]:
+    sample_start = datetime.combine(start - timedelta(days=1), datetime.min.time())
+    sample_end = datetime.combine(
+        end + timedelta(days=1), datetime.max.time().replace(microsecond=0)
+    )
+    samples = []
+    current = TZ.localize(sample_start)
+    end_local = TZ.localize(sample_end)
+    step = timedelta(hours=1)
+    while current <= end_local:
+        t = ts.utc(current.astimezone(pytz.utc))
+        dist_km = earth.at(t).observe(moon).distance().km
+        samples.append((current.date(), dist_km))
+        current += step
+    perigee_days, apogee_days = set(), set()
+    for i in range(1, len(samples) - 1):
+        day, dist = samples[i]
+        if not (start <= day <= end):
+            continue
+        prev_dist = samples[i - 1][1]
+        next_dist = samples[i + 1][1]
+        if dist < prev_dist and dist < next_dist:
+            perigee_days.add(day)
+        if dist > prev_dist and dist > next_dist:
+            apogee_days.add(day)
+    return perigee_days, apogee_days
+
+
+def build_calendar(start: date, end: date) -> list[DayInfo]:
+    if end < start:
+        raise ValueError(f"Invalid date range: {start} > {end}")
+    ts = load.timescale()
+    eph = load("de421.bsp")
+    earth, moon, sun = eph["earth"], eph["moon"], eph["sun"]
+    t0 = ts.utc(start.year, start.month, start.day)
+    t1 = ts.utc(end.year, end.month, end.day + 1)
+    f_phase = almanac.moon_phases(eph)
+    phase_times, phase_events = almanac.find_discrete(t0, t1, f_phase)
+    phase_by_day = {}
+    for t, ev in zip(phase_times, phase_events):
+        local_day = (
+            t.utc_datetime().replace(tzinfo=pytz.utc).astimezone(TZ).date()
+        )
+        phase_by_day[local_day] = [
+            "Nouvelle Lune", "Premier Quartier", "Pleine Lune", "Dernier Quartier"
+        ][int(ev)]
+    f_nodes = almanac.moon_nodes(eph)
+    node_times, _ = almanac.find_discrete(t0, t1, f_nodes)
+    node_days = set()
+    for t in node_times:
+        local_day = (
+            t.utc_datetime().replace(tzinfo=pytz.utc).astimezone(TZ).date()
+        )
+        node_days.add(local_day)
+    perigee_days, apogee_days = _compute_perigee_apogee_days(
+        ts, earth, moon, start, end
+    )
+    result = []
+    d = start
+    while d <= end:
+        local_noon = _local_noon(d)
+        t = ts.utc(local_noon.astimezone(pytz.utc))
+        e = earth.at(t)
+        v_sun = e.observe(sun).apparent()
+        v_moon = e.observe(moon).apparent()
+        sep = v_sun.separation_from(v_moon).radians
+        illum = (1 - math.cos(sep)) / 2
+        d2 = d + timedelta(days=1)
+        local_noon2 = _local_noon(d2)
+        t2 = ts.utc(local_noon2.astimezone(pytz.utc))
+        e2 = earth.at(t2)
+        v_sun2 = e2.observe(sun).apparent()
+        v_moon2 = e2.observe(moon).apparent()
+        sep2 = v_sun2.separation_from(v_moon2).radians
+        illum2 = (1 - math.cos(sep2)) / 2
+        croissante = "Croissante" if illum2 >= illum else "Décroissante"
+        dec = v_moon.radec()[1].degrees
+        dec2 = v_moon2.radec()[1].degrees
+        montante = "Montante" if dec2 >= dec else "Descendante"
+        lat, lon, dist = v_moon.ecliptic_latlon()
+        signe = zodiac_sign_from_lon(lon.degrees % 360.0)
+        type_jour = SIGN_TO_TYPE[signe]
+        result.append(
+            DayInfo(
+                date=d.isoformat(),
+                phase=phase_by_day.get(d, ""),
+                illumination=round(illum * 100, 2),
+                croissante_decroissante=croissante,
+                montante_descendante=montante,
+                signe=signe,
+                type_jour=type_jour,
+                perigee=(d in perigee_days),
+                apogee=(d in apogee_days),
+                noeud_lunaire=(d in node_days),
+            )
+        )
+        d += timedelta(days=1)
+    return result
diff --git a/backend/app/services/meteo.py b/backend/app/services/meteo.py
new file mode 100644
index 0000000..e5576b5
--- /dev/null
+++ b/backend/app/services/meteo.py
@@ -0,0 +1,127 @@
+"""Client Open-Meteo (gratuit, sans clé API)."""
+import json
+import os
+from datetime import datetime, timezone
+from pathlib import Path
+from typing import Any
+
+import httpx
+
+CACHE_PATH = Path(os.environ.get("UPLOAD_DIR", "/data")).parent / "meteo_cache.json"
+CACHE_TTL_SECONDS = 3 * 3600  # 3h
+
+WMO_LABELS = {
+    0: "Ensoleillé",
+    1: "Principalement ensoleillé",
+    2: "Partiellement nuageux",
+    3: "Couvert",
+    45: "Brouillard",
+    48: "Brouillard givrant",
+    51: "Bruine légère",
+    53: "Bruine modérée",
+    55: "Bruine dense",
+    61: "Pluie légère",
+    63: "Pluie modérée",
+    65: "Pluie forte",
+    71: "Neige légère",
+    73: "Neige modérée",
+    75: "Neige forte",
+    80: "Averses légères",
+    81: "Averses modérées",
+    82: "Averses violentes",
+    85: "Averses de neige",
+    95: "Orage",
+    96: "Orage avec grêle",
+    99: "Orage violent",
+}
+WMO_ICONS = {
+    0: "☀️",
+    1: "🌤",
+    2: "⛅",
+    3: "☁️",
+    45: "🌫",
+    48: "🌫",
+    51: "🌦",
+    53: "🌦",
+    55: "🌧",
+    61: "🌦",
+    63: "🌧",
+    65: "🌧",
+    71: "🌨",
+    73: "🌨",
+    75: "❄️",
+    80: "🌦",
+    81: "🌧",
+    82: "⛈",
+    85: "🌨",
+    95: "⛈",
+    96: "⛈",
+    99: "⛈",
+}
+
+
+def _cache_fresh() -> dict | None:
+    if not CACHE_PATH.exists():
+        return None
+    try:
+        data = json.loads(CACHE_PATH.read_text())
+        cached_at = datetime.fromisoformat(
+            data.get("cached_at", "2000-01-01T00:00:00+00:00")
+        )
+        if (datetime.now(timezone.utc) - cached_at).total_seconds() < CACHE_TTL_SECONDS:
+            return data
+    except Exception:
+        pass
+    return None
+
+
+def fetch_forecast(
+    lat: float = 45.14, lon: float = 4.12, days: int = 14
+) -> dict[str, Any]:
+    cached = _cache_fresh()
+    if cached:
+        return cached
+
+    url = "https://api.open-meteo.com/v1/forecast"
+    params = {
+        "latitude": lat,
+        "longitude": lon,
+        "daily": "temperature_2m_max,temperature_2m_min,precipitation_sum,windspeed_10m_max,weathercode",
+        "timezone": "Europe/Paris",
+        "forecast_days": min(days, 16),
+    }
+    try:
+        r = httpx.get(url, params=params, timeout=10)
+        r.raise_for_status()
+        raw = r.json()
+    except Exception as e:
+        return {"error": str(e), "days": []}
+
+    daily = raw.get("daily", {})
+    dates = daily.get("time", [])
+    result_days = []
+    for i, d in enumerate(dates):
+        code = int(daily.get("weathercode", [0] * len(dates))[i] or 0)
+        result_days.append(
+            {
+                "date": d,
+                "t_max": daily.get("temperature_2m_max", [None] * len(dates))[i],
+                "t_min": daily.get("temperature_2m_min", [None] * len(dates))[i],
+                "pluie_mm": daily.get("precipitation_sum", [0] * len(dates))[i] or 0,
+                "vent_kmh": daily.get("windspeed_10m_max", [0] * len(dates))[i] or 0,
+                "code": code,
+                "label": WMO_LABELS.get(code, "Inconnu"),
+                "icone": WMO_ICONS.get(code, "🌡"),
+            }
+        )
+
+    data = {
+        "cached_at": datetime.now(timezone.utc).isoformat(),
+        "days": result_days,
+    }
+    try:
+        CACHE_PATH.parent.mkdir(parents=True, exist_ok=True)
+        CACHE_PATH.write_text(json.dumps(data, ensure_ascii=False))
+    except Exception:
+        pass
+    return data
diff --git a/backend/app/services/redis_cache.py b/backend/app/services/redis_cache.py
new file mode 100644
index 0000000..660f837
--- /dev/null
+++ b/backend/app/services/redis_cache.py
@@ -0,0 +1,34 @@
+import hashlib
+import json
+import os
+from typing import Optional
+
+_client = None
+
+
+def _get_client():
+    global _client
+    if _client is None:
+        import redis
+        url = os.environ.get("REDIS_URL", "redis://localhost:6379")
+        _client = redis.from_url(url, decode_responses=True)
+    return _client
+
+
+def cache_key(image_bytes: bytes) -> str:
+    return f"identify:{hashlib.sha256(image_bytes).hexdigest()}"
+
+
+def get(image_bytes: bytes) -> Optional[list]:
+    try:
+        value = _get_client().get(cache_key(image_bytes))
+        return json.loads(value) if value else None
+    except Exception:
+        return None
+
+
+def set(image_bytes: bytes, results: list, ttl: int = 604800) -> None:
+    try:
+        _get_client().setex(cache_key(image_bytes), ttl, json.dumps(results))
+    except Exception:
+        pass  # cache indisponible → silencieux
diff --git a/backend/requirements.txt b/backend/requirements.txt
index ba62ba6..2bbfb60 100644
--- a/backend/requirements.txt
+++ b/backend/requirements.txt
@@ -5,3 +5,8 @@ python-multipart==0.0.12
 aiofiles==24.1.0
 pytest==8.3.3
 httpx==0.28.0
+Pillow==11.1.0
+skyfield==1.49
+pytz==2025.1
+numpy==2.2.3
+redis==5.2.1