p1: lat_fix

p1/specific_energy_comparison.py

@@ -551,7 +551,22 @@ def plot_latitude_effects(
     # Plot continuous curve
     ax.plot(latitudes, fuel_ratios, 'g-', linewidth=2, label='Fuel Ratio vs Latitude')
     
-    # Mark launch sites
+    # Mark launch sites with custom offsets to avoid overlap with curve
+    # Offsets: (x, y) in points - positive y moves text up, positive x moves right
+    label_offsets = {
+        '赤道': (5, -15),          # Below curve
+        'Kourou': (5, 8),          # Above curve
+        'SDSC': (5, -15),          # Below curve
+        'Texas': (-50, 8),         # Left and above
+        'Florida': (5, 8),         # Above curve
+        'California': (-60, -8),   # Left
+        'Virginia': (5, 8),        # Above curve
+        'Taiyuan': (-45, -12),     # Left and below
+        'Mahia': (5, 8),           # Above curve
+        'Alaska': (5, -15),        # Below curve
+        'Baikonur': (5, 8),        # Above curve
+    }
+    
     for name, site in LAUNCH_SITES.items():
         abs_lat = abs(site.latitude)
         site_temp = LaunchSite(site.name, abs_lat)
@@ -559,12 +574,14 @@ def plot_latitude_effects(
         ax.plot(abs_lat, result['fuel_ratio'], 'mo', markersize=8)
         # Simplified label
         label = site.name.split('(')[0].strip()
+        # Get custom offset for this site, default to (5, 8)
+        offset = label_offsets.get(name, (5, 8))
         ax.annotate(label, (abs_lat, result['fuel_ratio']), 
-                    textcoords="offset points", xytext=(3, 3), fontsize=8, rotation=15)
+                    textcoords="offset points", xytext=offset, fontsize=11)
     
     ax.set_xlabel('Latitude |φ| (°)', fontsize=12)
     ax.set_ylabel('Fuel / Payload Mass Ratio', fontsize=12)
-    ax.set_title(f'Fuel Requirement vs Launch Latitude{title_suffix}', fontsize=13)
+    # ax.set_title(f'Fuel Requirement vs Launch Latitude{title_suffix}', fontsize=13)
     ax.grid(True, alpha=0.3)
     ax.set_xlim(0, 65)