diff --git a/crates/modules/tahuantinsuyu/tahuantinsuyu-engine/src/bridge.rs b/crates/modules/tahuantinsuyu/tahuantinsuyu-engine/src/bridge.rs
index 2ac3c93..0c3c26c 100644
--- a/crates/modules/tahuantinsuyu/tahuantinsuyu-engine/src/bridge.rs
+++ b/crates/modules/tahuantinsuyu/tahuantinsuyu-engine/src/bridge.rs
@@ -292,7 +292,12 @@ fn build_render_model(
             deg: p.longitude.longitude_deg() as f32,
             symbol: body_symbol(p.body).into(),
             annotation: Some(format!("{:.1}°", p.longitude.degree_in_sign_decimal())),
-            retrograde: p.is_retrograde(),
+            // `BodyPlacement` cambió entre versiones de eternal entre
+            // `pub fn is_retrograde(&self) -> bool` y `pub
+            // is_retrograde: bool` — leemos el campo crudo
+            // `longitude_rate_rad_per_day` (estable en ambas) para no
+            // depender del wrapper.
+            retrograde: p.longitude_rate_rad_per_day < 0.0,
             house: Some(p.house_number),
         })
         .collect();