Erweitere Baryzentrum-Übergangstabelle

public/py/api.py

@@ -5801,8 +5801,11 @@ def action_barycenter(args: list[str]) -> dict:
     days_per_step = 365.25 / steps_per_year
     start_jd = now_time.tt - years_back * 365.25
     series = []
+    threshold_events = []
     max_dist_au = 0.0
     max_proj_dist_au = 0.0
+    previous_time_tt = None
+    previous_inside = None
     for i in range(total_steps + 1):
         t = astronomy.Time(start_jd + i * days_per_step)
         s = astronomy.BaryState(astronomy.Body.Sun, t)
@@ -5813,6 +5816,26 @@ def action_barycenter(args: list[str]) -> dict:
             max_dist_au = d
         if dp > max_proj_dist_au:
             max_proj_dist_au = dp
+        inside_sun = dp <= _SUN_RADIUS_AU
+        if previous_time_tt is not None and inside_sun != previous_inside:
+            left_tt = previous_time_tt
+            right_tt = t.tt
+            for _ in range(24):
+                middle_tt = (left_tt + right_tt) / 2
+                middle_sun = astronomy.BaryState(astronomy.Body.Sun, astronomy.Time(middle_tt))
+                middle_inside = math.hypot(-middle_sun.x, -middle_sun.y) <= _SUN_RADIUS_AU
+                if middle_inside == previous_inside:
+                    left_tt = middle_tt
+                else:
+                    right_tt = middle_tt
+
+            event_dt = datetime(2000, 1, 1, 12, tzinfo=timezone.utc) + timedelta(days=(left_tt + right_tt) / 2)
+            threshold_events.append({
+                "date_utc": event_dt.strftime("%Y-%m-%dT%H:%M:%SZ"),
+                "state": "inside" if inside_sun else "outside",
+            })
+        previous_time_tt = t.tt
+        previous_inside = inside_sun
         dt_utc = datetime(2000, 1, 1, 12, tzinfo=timezone.utc) + timedelta(days=t.tt - 0.0)
         # Epoche J2000.0 = 2000-01-01 12:00 TT ≈ UTC (Differenz <1 min hier vernachlässigt)
         series.append({
@@ -5889,6 +5912,7 @@ def action_barycenter(args: list[str]) -> dict:
         },
         "series": series,
         "series_dates": series_dates,
+        "threshold_events": threshold_events,
         "now_index": now_index,
         "max_dist_solar_radii": round(max_dist_au / _SUN_RADIUS_AU, 3),
         "max_proj_dist_solar_radii": round(max_proj_dist_au / _SUN_RADIUS_AU, 3),