diff --git a/crates/apps/tahuantinsuyu/src/shell.rs b/crates/apps/tahuantinsuyu/src/shell.rs
index 631f9ab..c050a89 100644
--- a/crates/apps/tahuantinsuyu/src/shell.rs
+++ b/crates/apps/tahuantinsuyu/src/shell.rs
@@ -22,7 +22,7 @@ use gpui::{
 use tahuantinsuyu_canvas::{
     AstrologyCanvas, CanvasEvent, CanvasMode, ThumbnailItem, ThumbnailScope,
 };
-use tahuantinsuyu_engine::{LayerKind, compute_at_offset};
+use tahuantinsuyu_engine::{LayerKind, compute_at_offset, compute_with_transits_at_now};
 use tahuantinsuyu_model::{Chart, TreeSelection};
 use tahuantinsuyu_panel::{ControlPanel, PanelEvent};
 use tahuantinsuyu_store::Store;
@@ -44,6 +44,9 @@ pub struct Shell {
     /// recomputarla con time-offsets sin re-leer la DB cada vez.
     current_chart: Option<Chart>,
     current_offset_minutes: i64,
+    /// Overlay de tránsitos al instante actual sobre la natal. Disparado
+    /// por el toggle `show_transits` del panel o la hotkey `[T]`.
+    show_transits: bool,
 }
 
 impl Shell {
@@ -78,6 +81,7 @@ impl Shell {
             panel,
             current_chart: None,
             current_offset_minutes: 0,
+            show_transits: false,
         }
     }
 
@@ -164,12 +168,20 @@ impl Shell {
         let Some(chart) = self.current_chart.as_ref() else {
             return;
         };
-        let render = match compute_at_offset(chart, self.current_offset_minutes) {
+        let result = if self.show_transits {
+            compute_with_transits_at_now(chart, self.current_offset_minutes)
+        } else {
+            compute_at_offset(chart, self.current_offset_minutes)
+        };
+        let render = match result {
             Ok(r) => r,
             Err(e) => {
                 eprintln!(
-                    "[shell] compute_at_offset {} (+{}min): {}",
-                    chart.id, self.current_offset_minutes, e
+                    "[shell] compute {}{} (+{}min): {}",
+                    chart.id,
+                    if self.show_transits { " +transits" } else { "" },
+                    self.current_offset_minutes,
+                    e
                 );
                 return;
             }
@@ -193,8 +205,17 @@ impl Shell {
                 }
             }
             CanvasEvent::LayerVisibilityChanged { kind, visible } => {
-                // Sync el panel para que el toggle visual coincida con
-                // lo que disparó el hotkey en el canvas.
+                // El toggle de Outer (hotkey [T]) significa "transit
+                // overlay" — no es solo un layer hide, dispara un
+                // recompute distinto. El resto son visibility puros.
+                if matches!(kind, LayerKind::Outer) {
+                    self.show_transits = *visible;
+                    self.panel.update(cx, |p, cx| {
+                        p.set_toggle("natal", "show_transits", *visible, cx)
+                    });
+                    self.render_current(cx);
+                    return;
+                }
                 let key = match kind {
                     LayerKind::SignDial => "show_sign_dial",
                     LayerKind::Houses => "show_houses",
@@ -213,9 +234,19 @@ impl Shell {
 
     fn on_panel_event(&mut self, ev: &PanelEvent, cx: &mut Context<Self>) {
         match ev {
-            PanelEvent::ControlChanged { module_id, key, value } => {
+            PanelEvent::ControlChanged {
+                module_id, key, value,
+            } => {
                 let visible = value.as_bool().unwrap_or(true);
                 if module_id == "natal" {
+                    if key == "show_transits" {
+                        self.show_transits = visible;
+                        self.canvas.update(cx, |c, cx| {
+                            c.set_layer_visible(LayerKind::Outer, visible, cx)
+                        });
+                        self.render_current(cx);
+                        return;
+                    }
                     let kind = match key.as_str() {
                         "show_sign_dial" => Some(LayerKind::SignDial),
                         "show_houses" => Some(LayerKind::Houses),
@@ -230,7 +261,7 @@ impl Shell {
                 }
             }
             PanelEvent::ModuleToggled { .. } => {
-                // Fase 5: encender/apagar módulos enteros (Transit,
+                // Fase 6: encender/apagar módulos enteros (Progression,
                 // Synastry, Uranian).
             }
         }
diff --git a/crates/modules/tahuantinsuyu/tahuantinsuyu-canvas/src/lib.rs b/crates/modules/tahuantinsuyu/tahuantinsuyu-canvas/src/lib.rs
index 95b787a..43be368 100644
--- a/crates/modules/tahuantinsuyu/tahuantinsuyu-canvas/src/lib.rs
+++ b/crates/modules/tahuantinsuyu/tahuantinsuyu-canvas/src/lib.rs
@@ -279,6 +279,7 @@ impl AstrologyCanvas {
             "h" | "H" => LayerKind::Houses,
             "x" | "X" => LayerKind::Aspects,
             "p" | "P" => LayerKind::Bodies,
+            "t" | "T" => LayerKind::Outer,
             "r" | "R" => {
                 self.reset_time_offset(cx);
                 return;
@@ -534,7 +535,7 @@ fn render_wheel(
         }
     }
 
-    // Planet glyphs.
+    // Planet glyphs (natal).
     if visible.get(&LayerKind::Bodies).copied().unwrap_or(true) {
         for layer in &render.layers {
             if matches!(layer.kind, LayerKind::Bodies) {
@@ -559,6 +560,31 @@ fn render_wheel(
         }
     }
 
+    // Planet glyphs (transit ring) — solo si la capa Outer está activa.
+    if visible.get(&LayerKind::Outer).copied().unwrap_or(true) {
+        for layer in &render.layers {
+            if matches!(layer.kind, LayerKind::Outer) && layer.module_id == "transit" {
+                for g in &layer.glyphs {
+                    let (x, y) = polar_to_screen(g.deg, asc, rot_offset, radii.transits);
+                    let color = with_alpha(planet_color(palette, &g.symbol), 0.9);
+                    let glyph_text = if g.retrograde {
+                        format!("{}ᴿ", planet_unicode(&g.symbol))
+                    } else {
+                        planet_unicode(&g.symbol).into()
+                    };
+                    wheel = wheel.child(centered_glyph(
+                        cx_center + x,
+                        cy_center + y,
+                        20.0,
+                        14.0,
+                        glyph_text.into(),
+                        color,
+                    ));
+                }
+            }
+        }
+    }
+
     // --- Header + footer + indicador de tiempo ---
     let header = div()
         .flex()
@@ -611,7 +637,7 @@ fn render_wheel(
             div()
                 .text_size(px(10.0))
                 .text_color(theme.fg_disabled)
-                .child("[D]ial [H]ouses as[X]pects [P]lanets [R]eset"),
+                .child("[D]ial [H]ouses as[X]pects [P]lanets [T]ransits [R]eset"),
         );
 
     div()
@@ -650,6 +676,10 @@ fn format_offset(minutes: i64) -> String {
 struct Radii {
     sign_outer: f32,
     sign_inner: f32,
+    /// Anillo de glifos de tránsito (cuando el overlay está activo).
+    /// Vive entre `sign_inner` y `houses_outer`; queda vacío cuando no
+    /// hay capa Outer.
+    transits: f32,
     houses_outer: f32,
     houses_inner: f32,
     bodies: f32,
@@ -661,10 +691,11 @@ impl Radii {
         Self {
             sign_outer: r,
             sign_inner: r * 0.88,
-            houses_outer: r * 0.86,
-            houses_inner: r * 0.72,
-            bodies: r * 0.65,
-            aspects: r * 0.58,
+            transits: r * 0.82,
+            houses_outer: r * 0.78,
+            houses_inner: r * 0.66,
+            bodies: r * 0.58,
+            aspects: r * 0.50,
         }
     }
 }
@@ -779,32 +810,49 @@ fn paint_wheel(
         );
     }
 
-    // 3. Aspectos.
+    // 3. Aspectos. Distinguir natal (line entre dos puntos en r_aspects)
+    // del transit (line natal → transit, distintos radios).
     if show(LayerKind::Aspects) {
         for layer in layers {
             if matches!(layer.kind, LayerKind::Aspects) {
                 if let Geometry::Lines(segs) = &layer.geometry {
+                    let is_transit = layer.module_id == "transit";
                     for seg in segs {
                         let color = aspect_color(palette, &seg.kind);
                         let color = with_alpha(color, color.a * seg.opacity);
-                        paint_aspect_line(
-                            window,
-                            cx,
-                            cy,
-                            seg.from_deg,
-                            seg.to_deg,
-                            ascendant_deg,
-                            rot_offset_deg,
-                            radii.aspects,
-                            color,
-                        );
+                        if is_transit {
+                            paint_cross_aspect_line(
+                                window,
+                                cx,
+                                cy,
+                                seg.from_deg,
+                                seg.to_deg,
+                                ascendant_deg,
+                                rot_offset_deg,
+                                radii.bodies,
+                                radii.transits,
+                                color,
+                            );
+                        } else {
+                            paint_aspect_line(
+                                window,
+                                cx,
+                                cy,
+                                seg.from_deg,
+                                seg.to_deg,
+                                ascendant_deg,
+                                rot_offset_deg,
+                                radii.aspects,
+                                color,
+                            );
+                        }
                     }
                 }
             }
         }
     }
 
-    // 4. Dots de cuerpos.
+    // 4. Dots de cuerpos (natal).
     if show(LayerKind::Bodies) {
         let dot_r = (radii.sign_outer * 0.018).max(2.0);
         for layer in layers {
@@ -818,6 +866,42 @@ fn paint_wheel(
             }
         }
     }
+
+    // 5. Outer ring (transit overlay): anillo guía + dots de transit.
+    let transit_active = layers
+        .iter()
+        .any(|l| matches!(l.kind, LayerKind::Outer) && l.module_id == "transit");
+    if transit_active && show(LayerKind::Outer) {
+        // Anillos guía para delimitar el slot.
+        stroke_circle(
+            window,
+            cx,
+            cy,
+            radii.transits + radii.sign_outer * 0.035,
+            0.6,
+            with_alpha(palette.dial_ring, 0.4),
+        );
+        stroke_circle(
+            window,
+            cx,
+            cy,
+            radii.transits - radii.sign_outer * 0.035,
+            0.6,
+            with_alpha(palette.dial_ring, 0.4),
+        );
+
+        let dot_r = (radii.sign_outer * 0.017).max(2.0);
+        for layer in layers {
+            if matches!(layer.kind, LayerKind::Outer) && layer.module_id == "transit" {
+                for g in &layer.glyphs {
+                    let color = with_alpha(planet_color(palette, &g.symbol), 0.85);
+                    let (x, y) =
+                        polar_to_screen(g.deg, ascendant_deg, rot_offset_deg, radii.transits);
+                    fill_circle(window, cx + x, cy + y, dot_r, color);
+                }
+            }
+        }
+    }
 }
 
 fn paint_sign_sectors(
@@ -939,6 +1023,33 @@ fn paint_aspect_line(
     }
 }
 
+/// Línea de aspecto natal ↔ tránsito: extremos en radios distintos.
+/// El `from_deg` cae sobre el ring de cuerpos natales (`r_from`); el
+/// `to_deg` sobre el ring de tránsito (`r_to`). Trazo más fino que el
+/// natal-natal para no competir visualmente.
+#[allow(clippy::too_many_arguments)]
+fn paint_cross_aspect_line(
+    window: &mut Window,
+    cx: f32,
+    cy: f32,
+    natal_deg: f32,
+    transit_deg: f32,
+    ascendant_deg: f32,
+    rot_offset_deg: f32,
+    r_from: f32,
+    r_to: f32,
+    color: Hsla,
+) {
+    let (xa, ya) = polar_to_screen(natal_deg, ascendant_deg, rot_offset_deg, r_from);
+    let (xb, yb) = polar_to_screen(transit_deg, ascendant_deg, rot_offset_deg, r_to);
+    let mut builder = PathBuilder::stroke(px(0.7));
+    builder.move_to(point(px(cx + xa), px(cy + ya)));
+    builder.line_to(point(px(cx + xb), px(cy + yb)));
+    if let Ok(path) = builder.build() {
+        window.paint_path(path, color);
+    }
+}
+
 // =====================================================================
 // Helpers
 // =====================================================================
diff --git a/crates/modules/tahuantinsuyu/tahuantinsuyu-engine/src/bridge.rs b/crates/modules/tahuantinsuyu/tahuantinsuyu-engine/src/bridge.rs
index 4929895..5511832 100644
--- a/crates/modules/tahuantinsuyu/tahuantinsuyu-engine/src/bridge.rs
+++ b/crates/modules/tahuantinsuyu/tahuantinsuyu-engine/src/bridge.rs
@@ -9,8 +9,8 @@ use std::sync::OnceLock;
 use std::time::Instant;
 
 use eternal_astrology::{
-    find_aspects, Aspect, AspectKind as EAspectKind, BirthData, BodySet, ChartConfig,
-    HouseSystem as EHouseSystem, NatalChart, OrbTable, Zodiac as EZodiac,
+    find_aspects, find_synastry_aspects, Aspect, AspectKind as EAspectKind, BirthData, BodySet,
+    ChartConfig, HouseSystem as EHouseSystem, NatalChart, OrbTable, Zodiac as EZodiac,
 };
 use eternal_sky::{Ayanamsha, Body, EphemerisSession, Instant as ESInstant, Observer, SessionConfig};
 
@@ -173,10 +173,15 @@ fn aspect_kind_id(k: EAspectKind) -> &'static str {
 // compute()
 // =====================================================================
 
-pub fn compute_at_offset(chart: &Chart, offset_minutes: i64) -> Result<RenderModel, EngineError> {
-    let t0 = Instant::now();
+/// Construye los tipos eternales (`BirthData`, `ChartConfig`) desde el
+/// `Chart` agnóstico, aplicando el offset temporal. Devuelve también el
+/// `Observer` y la `ChartConfig` para reusar en pipelines extendidas
+/// (transits, sinastría) sin re-traducir.
+fn build_eternal_inputs(
+    chart: &Chart,
+    offset_minutes: i64,
+) -> Result<(BirthData, ChartConfig, Observer), EngineError> {
     chart.validate()?;
-
     let bd = &chart.birth_data;
     let base_instant = ESInstant::from_civil_local(
         bd.year,
@@ -197,10 +202,6 @@ pub fn compute_at_offset(chart: &Chart, offset_minutes: i64) -> Result<RenderMod
     )
     .map_err(|e| EngineError::Eternal(format!("Instant::from_civil_local: {:?}", e)))?;
 
-    // Aplicar el offset (en minutos) sumando segundos al UTC y
-    // reconstruyendo el `Instant`. `UTC::add_seconds` está disponible
-    // pero opera sobre la representación interna; el `Instant` la
-    // re-envuelve vía `from_utc`.
     let instant = if offset_minutes == 0 {
         base_instant
     } else {
@@ -209,29 +210,134 @@ pub fn compute_at_offset(chart: &Chart, offset_minutes: i64) -> Result<RenderMod
     };
 
     let observer = Observer::from_degrees(bd.latitude_deg, bd.longitude_deg, bd.altitude_m);
-
     let mut birth_e = BirthData::new(instant, observer);
     if let Some(name) = &bd.subject_name {
         birth_e = birth_e.with_name(name.clone());
     }
-
     let config_e = ChartConfig {
         house_system: map_house_system(chart.config.house_system),
         zodiac: map_zodiac(chart.config.zodiac, chart.config.ayanamsha.as_deref()),
         bodies: map_body_set(&chart.config),
         include_horizon: false,
     };
+    Ok((birth_e, config_e, observer))
+}
 
+/// Computa solo la `NatalChart` (sin construir RenderModel). Útil para
+/// pipelines compuestas (transits, sinastría) que necesitan el natal
+/// crudo para correr `find_synastry_aspects`.
+fn compute_natal_chart(
+    chart: &Chart,
+    offset_minutes: i64,
+) -> Result<(NatalChart, ChartConfig, Observer), EngineError> {
+    let (birth_e, config_e, observer) = build_eternal_inputs(chart, offset_minutes)?;
     let session = session()?;
     let natal = NatalChart::compute(&birth_e, &config_e, session)
         .map_err(|e| EngineError::Eternal(format!("NatalChart::compute: {:?}", e)))?;
+    Ok((natal, config_e, observer))
+}
 
+pub fn compute_at_offset(chart: &Chart, offset_minutes: i64) -> Result<RenderModel, EngineError> {
+    let t0 = Instant::now();
+    let (natal, _, _) = compute_natal_chart(chart, offset_minutes)?;
     let aspects = find_aspects(&natal, &OrbTable::modern_western());
+    Ok(build_render_model(chart, &natal, &aspects, t0))
+}
 
-    let render = build_render_model(chart, &natal, &aspects, t0);
+/// Pipeline natal + overlay de tránsitos. Computa la carta natal
+/// (eventualmente con un `offset_minutes` aplicado) **y además** una
+/// segunda `NatalChart` con el mismo observer pero al instante
+/// `transit_at` (usualmente `Instant::now()`). Devuelve un `RenderModel`
+/// con dos capas extra:
+///
+/// - `LayerKind::Outer` con `module_id = "transit"` — glifos
+///   planetarios del cielo actual, pintados en un anillo externo.
+/// - `LayerKind::Aspects` con `module_id = "transit"` — aspectos cross
+///   natal × transit (sólo mayores). Convención: `LineSeg.from_deg` =
+///   longitud natal, `LineSeg.to_deg` = longitud transit.
+pub fn compute_with_transits(
+    chart: &Chart,
+    offset_minutes: i64,
+    transit_at: ESInstant,
+) -> Result<RenderModel, EngineError> {
+    let t0 = Instant::now();
+    let (natal, config_e, observer) = compute_natal_chart(chart, offset_minutes)?;
+    let aspects = find_aspects(&natal, &OrbTable::modern_western());
+    let mut render = build_render_model(chart, &natal, &aspects, t0);
+
+    // Carta de tránsito: mismo observer, mismo config, instante "ahora".
+    let transit_birth = BirthData::new(transit_at, observer);
+    let session = session()?;
+    let transit = NatalChart::compute(&transit_birth, &config_e, session).map_err(|e| {
+        EngineError::Eternal(format!("NatalChart::compute (transit): {:?}", e))
+    })?;
+
+    // Outer ring de glifos: planetas del cielo actual.
+    let outer_glyphs: Vec<Glyph> = transit
+        .placements
+        .iter()
+        .map(|p| Glyph {
+            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.longitude_rate_rad_per_day < 0.0,
+            house: None,
+        })
+        .collect();
+    render.layers.push(Layer {
+        module_id: "transit".into(),
+        kind: LayerKind::Outer,
+        ring: 0.82,
+        z: 4,
+        geometry: Geometry::GlyphsOnly,
+        glyphs: outer_glyphs,
+    });
+
+    // Cross aspects natal × transit. find_synastry_aspects toma una lista
+    // de `AspectKind`s — usamos solo mayores para no saturar.
+    let cross = find_synastry_aspects(
+        &natal,
+        &transit,
+        &OrbTable::modern_western(),
+        EAspectKind::MAJORS,
+    );
+    let cross_lines: Vec<LineSeg> = cross
+        .iter()
+        .filter_map(|a| {
+            let natal_p = natal.placement(a.person_a_body)?;
+            let transit_p = transit.placement(a.person_b_body)?;
+            let opacity = orb_to_opacity(a.orb_abs_deg(), a.kind);
+            Some(LineSeg {
+                from_deg: natal_p.longitude.longitude_deg() as f32,
+                to_deg: transit_p.longitude.longitude_deg() as f32,
+                kind: aspect_kind_id(a.kind).into(),
+                // Apagamos un poco más los cross para distinguirlos del
+                // tejido natal-natal.
+                opacity: opacity * 0.75,
+            })
+        })
+        .collect();
+    render.layers.push(Layer {
+        module_id: "transit".into(),
+        kind: LayerKind::Aspects,
+        ring: 0.0,
+        z: 5,
+        geometry: Geometry::Lines(cross_lines),
+        glyphs: Vec::new(),
+    });
+
+    render.compute_ms = t0.elapsed().as_millis() as u64;
     Ok(render)
 }
 
+/// Atajo: tránsitos al instante actual del reloj.
+pub fn compute_with_transits_at_now(
+    chart: &Chart,
+    offset_minutes: i64,
+) -> Result<RenderModel, EngineError> {
+    compute_with_transits(chart, offset_minutes, ESInstant::now())
+}
+
 // =====================================================================
 // NatalChart → RenderModel
 // =====================================================================
diff --git a/crates/modules/tahuantinsuyu/tahuantinsuyu-engine/src/lib.rs b/crates/modules/tahuantinsuyu/tahuantinsuyu-engine/src/lib.rs
index 51118d6..f0e0912 100644
--- a/crates/modules/tahuantinsuyu/tahuantinsuyu-engine/src/lib.rs
+++ b/crates/modules/tahuantinsuyu/tahuantinsuyu-engine/src/lib.rs
@@ -173,6 +173,33 @@ pub fn compute_at_offset(chart: &Chart, offset_minutes: i64) -> Result<RenderMod
     }
 }
 
+/// Variante con overlay de tránsitos al **instante actual** (reloj de
+/// pared). Computa la carta natal igual que [`compute_at_offset`] y le
+/// suma dos capas extras:
+///
+/// - `LayerKind::Outer` con `module_id = "transit"` — glifos
+///   planetarios del cielo del momento, sobre un anillo externo.
+/// - `LayerKind::Aspects` con `module_id = "transit"` — líneas natal ↔
+///   transit (sólo aspectos mayores). Por convención, en cada
+///   `LineSeg` el `from_deg` es la longitud natal y el `to_deg` la
+///   longitud del planeta de tránsito.
+///
+/// Sin el feature `eternal-bridge` cae al mock (sin overlay).
+pub fn compute_with_transits_at_now(
+    chart: &Chart,
+    offset_minutes: i64,
+) -> Result<RenderModel, EngineError> {
+    #[cfg(feature = "eternal-bridge")]
+    {
+        bridge::compute_with_transits_at_now(chart, offset_minutes)
+    }
+    #[cfg(not(feature = "eternal-bridge"))]
+    {
+        let _ = offset_minutes;
+        Ok(compute_mock(chart))
+    }
+}
+
 /// Stub determinista — útil para tests + para la UI sin eternal.
 pub fn compute_mock(chart: &Chart) -> RenderModel {
     use std::time::Instant;
diff --git a/crates/modules/tahuantinsuyu/tahuantinsuyu-modules/src/lib.rs b/crates/modules/tahuantinsuyu/tahuantinsuyu-modules/src/lib.rs
index 228503b..2c7eaaa 100644
--- a/crates/modules/tahuantinsuyu/tahuantinsuyu-modules/src/lib.rs
+++ b/crates/modules/tahuantinsuyu/tahuantinsuyu-modules/src/lib.rs
@@ -203,6 +203,12 @@ pub mod natal {
                     default: true,
                     hotkey: Some("P".into()),
                 },
+                Control::Toggle {
+                    key: "show_transits".into(),
+                    label: "Tránsitos (ahora)".into(),
+                    default: false,
+                    hotkey: Some("T".into()),
+                },
                 Control::Slider {
                     key: "harmonic".into(),
                     label: "Armónico".into(),