diff --git a/project.godot b/project.godot
index 28f3478..f0c8898 100644
--- a/project.godot
+++ b/project.godot
@@ -8,6 +8,442 @@
 
 config_version=4
 
+_global_script_classes=[ {
+"base": "Reference",
+"class": "IVAssetInitializer",
+"language": "GDScript",
+"path": "res://ivoyager/initializers/asset_initializer.gd"
+}, {
+"base": "Reference",
+"class": "IVAsteroidGroup",
+"language": "GDScript",
+"path": "res://ivoyager/tree_refs/asteroid_group.gd"
+}, {
+"base": "Spatial",
+"class": "IVBody",
+"language": "GDScript",
+"path": "res://ivoyager/tree_nodes/body.gd"
+}, {
+"base": "Reference",
+"class": "IVBodyBuilder",
+"language": "GDScript",
+"path": "res://ivoyager/prog_builders/body_builder.gd"
+}, {
+"base": "Reference",
+"class": "IVBodyList",
+"language": "GDScript",
+"path": "res://ivoyager/tree_refs/body_list.gd"
+}, {
+"base": "Reference",
+"class": "IVCacheManager",
+"language": "GDScript",
+"path": "res://ivoyager/prog_refs/cache_manager.gd"
+}, {
+"base": "PopupPanel",
+"class": "IVCachedItemsPopup",
+"language": "GDScript",
+"path": "res://ivoyager/gui_admin/cached_items_popup.gd"
+}, {
+"base": "Camera",
+"class": "IVCamera",
+"language": "GDScript",
+"path": "res://ivoyager/tree_nodes/camera.gd"
+}, {
+"base": "Node",
+"class": "IVCameraHandler",
+"language": "GDScript",
+"path": "res://ivoyager/prog_nodes/camera_handler.gd"
+}, {
+"base": "Reference",
+"class": "IVComposition",
+"language": "GDScript",
+"path": "res://ivoyager/tree_refs/composition.gd"
+}, {
+"base": "Reference",
+"class": "IVCompositionBuilder",
+"language": "GDScript",
+"path": "res://ivoyager/prog_builders/composition_builder.gd"
+}, {
+"base": "PopupPanel",
+"class": "IVCreditsPopup",
+"language": "GDScript",
+"path": "res://ivoyager/gui_admin/credits_popup.gd"
+}, {
+"base": "Reference",
+"class": "IVDebug",
+"language": "GDScript",
+"path": "res://ivoyager/static/debug.gd"
+}, {
+"base": "Reference",
+"class": "IVEnums",
+"language": "GDScript",
+"path": "res://ivoyager/static/enums.gd"
+}, {
+"base": "Reference",
+"class": "IVEnvironmentBuilder",
+"language": "GDScript",
+"path": "res://ivoyager/prog_builders/environment_builder.gd"
+}, {
+"base": "Reference",
+"class": "IVFiles",
+"language": "GDScript",
+"path": "res://ivoyager/static/files.gd"
+}, {
+"base": "Reference",
+"class": "IVFontManager",
+"language": "GDScript",
+"path": "res://ivoyager/prog_refs/font_manager.gd"
+}, {
+"base": "Label",
+"class": "IVHUDLabel",
+"language": "GDScript",
+"path": "res://ivoyager/tree_nodes/hud_label.gd"
+}, {
+"base": "MeshInstance",
+"class": "IVHUDOrbit",
+"language": "GDScript",
+"path": "res://ivoyager/tree_nodes/hud_orbit.gd"
+}, {
+"base": "MeshInstance",
+"class": "IVHUDPoints",
+"language": "GDScript",
+"path": "res://ivoyager/tree_nodes/hud_points.gd"
+}, {
+"base": "Reference",
+"class": "IVHUDsBuilder",
+"language": "GDScript",
+"path": "res://ivoyager/prog_builders/huds_builder.gd"
+}, {
+"base": "Node",
+"class": "IVHUDsManager",
+"language": "GDScript",
+"path": "res://ivoyager/prog_nodes/huds_manager.gd"
+}, {
+"base": "IVCachedItemsPopup",
+"class": "IVHotkeysPopup",
+"language": "GDScript",
+"path": "res://ivoyager/gui_admin/hotkeys_popup.gd"
+}, {
+"base": "Reference",
+"class": "IVIOManager",
+"language": "GDScript",
+"path": "res://ivoyager/prog_refs/io_manager.gd"
+}, {
+"base": "IVCacheManager",
+"class": "IVInputMapManager",
+"language": "GDScript",
+"path": "res://ivoyager/prog_refs/input_map_manager.gd"
+}, {
+"base": "Spatial",
+"class": "IVLPoint",
+"language": "GDScript",
+"path": "res://ivoyager/tree_nodes/l_point.gd"
+}, {
+"base": "Reference",
+"class": "IVLagrangePointBuilder",
+"language": "GDScript",
+"path": "res://ivoyager/prog_builders/lagrange_point_builder.gd"
+}, {
+"base": "Reference",
+"class": "IVLightBuilder",
+"language": "GDScript",
+"path": "res://ivoyager/prog_builders/light_builder.gd"
+}, {
+"base": "FileDialog",
+"class": "IVLoadDialog",
+"language": "GDScript",
+"path": "res://ivoyager/gui_admin/load_dialog.gd"
+}, {
+"base": "Reference",
+"class": "IVLogInitializer",
+"language": "GDScript",
+"path": "res://ivoyager/initializers/log_initializer.gd"
+}, {
+"base": "Reference",
+"class": "IVMainMenuManager",
+"language": "GDScript",
+"path": "res://ivoyager/prog_refs/main_menu_manager.gd"
+}, {
+"base": "Popup",
+"class": "IVMainMenuPopup",
+"language": "GDScript",
+"path": "res://ivoyager/gui_admin/main_menu_popup.gd"
+}, {
+"base": "ProgressBar",
+"class": "IVMainProgBar",
+"language": "GDScript",
+"path": "res://ivoyager/gui_admin/main_prog_bar.gd"
+}, {
+"base": "Reference",
+"class": "IVMath",
+"language": "GDScript",
+"path": "res://ivoyager/static/math.gd"
+}, {
+"base": "Reference",
+"class": "IVMinorBodiesBuilder",
+"language": "GDScript",
+"path": "res://ivoyager/prog_builders/minor_bodies_builder.gd"
+}, {
+"base": "Node",
+"class": "IVMinorBodiesManager",
+"language": "GDScript",
+"path": "res://ivoyager/prog_nodes/minor_bodies_manager.gd"
+}, {
+"base": "Reference",
+"class": "IVModelBuilder",
+"language": "GDScript",
+"path": "res://ivoyager/prog_builders/model_builder.gd"
+}, {
+"base": "Reference",
+"class": "IVModelController",
+"language": "GDScript",
+"path": "res://ivoyager/tree_refs/model_controller.gd"
+}, {
+"base": "ConfirmationDialog",
+"class": "IVOneUseConfirm",
+"language": "GDScript",
+"path": "res://ivoyager/gui_admin/one_use_confirm.gd"
+}, {
+"base": "IVCachedItemsPopup",
+"class": "IVOptionsPopup",
+"language": "GDScript",
+"path": "res://ivoyager/gui_admin/options_popup.gd"
+}, {
+"base": "Reference",
+"class": "IVOrbit",
+"language": "GDScript",
+"path": "res://ivoyager/tree_refs/orbit.gd"
+}, {
+"base": "Reference",
+"class": "IVOrbitBuilder",
+"language": "GDScript",
+"path": "res://ivoyager/prog_builders/orbit_builder.gd"
+}, {
+"base": "Node",
+"class": "IVPointsManager",
+"language": "GDScript",
+"path": "res://ivoyager/prog_nodes/points_manager.gd"
+}, {
+"base": "Control",
+"class": "IVProjectionSurface",
+"language": "GDScript",
+"path": "res://ivoyager/tree_nodes/projection_surface.gd"
+}, {
+"base": "Reference",
+"class": "IVQuantityFormatter",
+"language": "GDScript",
+"path": "res://ivoyager/prog_refs/quantity_formatter.gd"
+}, {
+"base": "Reference",
+"class": "IVRangeValue",
+"language": "GDScript",
+"path": "res://ivoyager/tree_refs/range_value.gd"
+}, {
+"base": "PopupPanel",
+"class": "IVRichTextPopup",
+"language": "GDScript",
+"path": "res://ivoyager/gui_admin/rich_text_popup.gd"
+}, {
+"base": "Reference",
+"class": "IVRingsBuilder",
+"language": "GDScript",
+"path": "res://ivoyager/prog_builders/rings_builder.gd"
+}, {
+"base": "Reference",
+"class": "IVSaveBuilder",
+"language": "GDScript",
+"path": "res://ivoyager/prog_builders/save_builder.gd"
+}, {
+"base": "FileDialog",
+"class": "IVSaveDialog",
+"language": "GDScript",
+"path": "res://ivoyager/gui_admin/save_dialog.gd"
+}, {
+"base": "Node",
+"class": "IVSaveManager",
+"language": "GDScript",
+"path": "res://ivoyager/prog_nodes/save_manager.gd"
+}, {
+"base": "Node",
+"class": "IVScheduler",
+"language": "GDScript",
+"path": "res://ivoyager/prog_nodes/scheduler.gd"
+}, {
+"base": "Reference",
+"class": "IVSelection",
+"language": "GDScript",
+"path": "res://ivoyager/tree_refs/selection.gd"
+}, {
+"base": "Reference",
+"class": "IVSelectionBuilder",
+"language": "GDScript",
+"path": "res://ivoyager/prog_builders/selection_builder.gd"
+}, {
+"base": "Node",
+"class": "IVSelectionManager",
+"language": "GDScript",
+"path": "res://ivoyager/tree_nodes/selection_manager.gd"
+}, {
+"base": "IVCacheManager",
+"class": "IVSettingsManager",
+"language": "GDScript",
+"path": "res://ivoyager/prog_refs/settings_manager.gd"
+}, {
+"base": "Reference",
+"class": "IVSleepManager",
+"language": "GDScript",
+"path": "res://ivoyager/prog_refs/sleep_manager.gd"
+}, {
+"base": "Node",
+"class": "IVStateManager",
+"language": "GDScript",
+"path": "res://ivoyager/prog_nodes/state_manager.gd"
+}, {
+"base": "Reference",
+"class": "IVSystemBuilder",
+"language": "GDScript",
+"path": "res://ivoyager/prog_builders/system_builder.gd"
+}, {
+"base": "Reference",
+"class": "IVTableImporter",
+"language": "GDScript",
+"path": "res://ivoyager/initializers/table_importer.gd"
+}, {
+"base": "Reference",
+"class": "IVTableReader",
+"language": "GDScript",
+"path": "res://ivoyager/prog_refs/table_reader.gd"
+}, {
+"base": "Reference",
+"class": "IVThemeManager",
+"language": "GDScript",
+"path": "res://ivoyager/prog_refs/theme_manager.gd"
+}, {
+"base": "Node",
+"class": "IVTimekeeper",
+"language": "GDScript",
+"path": "res://ivoyager/prog_nodes/timekeeper.gd"
+}, {
+"base": "Reference",
+"class": "IVTranslationImporter",
+"language": "GDScript",
+"path": "res://ivoyager/initializers/translation_importer.gd"
+}, {
+"base": "Reference",
+"class": "IVUnits",
+"language": "GDScript",
+"path": "res://ivoyager/static/units.gd"
+}, {
+"base": "Reference",
+"class": "IVUtils",
+"language": "GDScript",
+"path": "res://ivoyager/static/utils.gd"
+}, {
+"base": "Reference",
+"class": "IVView",
+"language": "GDScript",
+"path": "res://ivoyager/tree_refs/view.gd"
+}, {
+"base": "Reference",
+"class": "IVVisualsHelper",
+"language": "GDScript",
+"path": "res://ivoyager/prog_refs/visuals_helper.gd"
+}, {
+"base": "Reference",
+"class": "IVWidgets",
+"language": "GDScript",
+"path": "res://ivoyager/static/widgets.gd"
+}, {
+"base": "Reference",
+"class": "IVWikiInitializer",
+"language": "GDScript",
+"path": "res://ivoyager/initializers/wiki_initializer.gd"
+}, {
+"base": "Reference",
+"class": "IVWikiManager",
+"language": "GDScript",
+"path": "res://ivoyager/prog_refs/wiki_manager.gd"
+}, {
+"base": "Node",
+"class": "IVWindowManager",
+"language": "GDScript",
+"path": "res://ivoyager/prog_nodes/window_manager.gd"
+} ]
+_global_script_class_icons={
+"IVAssetInitializer": "",
+"IVAsteroidGroup": "",
+"IVBody": "",
+"IVBodyBuilder": "",
+"IVBodyList": "",
+"IVCacheManager": "",
+"IVCachedItemsPopup": "",
+"IVCamera": "",
+"IVCameraHandler": "",
+"IVComposition": "",
+"IVCompositionBuilder": "",
+"IVCreditsPopup": "",
+"IVDebug": "",
+"IVEnums": "",
+"IVEnvironmentBuilder": "",
+"IVFiles": "",
+"IVFontManager": "",
+"IVHUDLabel": "",
+"IVHUDOrbit": "",
+"IVHUDPoints": "",
+"IVHUDsBuilder": "",
+"IVHUDsManager": "",
+"IVHotkeysPopup": "",
+"IVIOManager": "",
+"IVInputMapManager": "",
+"IVLPoint": "",
+"IVLagrangePointBuilder": "",
+"IVLightBuilder": "",
+"IVLoadDialog": "",
+"IVLogInitializer": "",
+"IVMainMenuManager": "",
+"IVMainMenuPopup": "",
+"IVMainProgBar": "",
+"IVMath": "",
+"IVMinorBodiesBuilder": "",
+"IVMinorBodiesManager": "",
+"IVModelBuilder": "",
+"IVModelController": "",
+"IVOneUseConfirm": "",
+"IVOptionsPopup": "",
+"IVOrbit": "",
+"IVOrbitBuilder": "",
+"IVPointsManager": "",
+"IVProjectionSurface": "",
+"IVQuantityFormatter": "",
+"IVRangeValue": "",
+"IVRichTextPopup": "",
+"IVRingsBuilder": "",
+"IVSaveBuilder": "",
+"IVSaveDialog": "",
+"IVSaveManager": "",
+"IVScheduler": "",
+"IVSelection": "",
+"IVSelectionBuilder": "",
+"IVSelectionManager": "",
+"IVSettingsManager": "",
+"IVSleepManager": "",
+"IVStateManager": "",
+"IVSystemBuilder": "",
+"IVTableImporter": "",
+"IVTableReader": "",
+"IVThemeManager": "",
+"IVTimekeeper": "",
+"IVTranslationImporter": "",
+"IVUnits": "",
+"IVUtils": "",
+"IVView": "",
+"IVVisualsHelper": "",
+"IVWidgets": "",
+"IVWikiInitializer": "",
+"IVWikiManager": "",
+"IVWindowManager": ""
+}
+
 [application]
 
 config/name="learnin"
diff --git a/scenes/Main.tscn b/scenes/Main.tscn
index 990a849..a269a98 100644
--- a/scenes/Main.tscn
+++ b/scenes/Main.tscn
@@ -1,19 +1,15 @@
-[gd_scene load_steps=4 format=2]
+[gd_scene load_steps=3 format=2]
 
-[ext_resource path="res://scenes/Train.tscn" type="PackedScene" id=1]
-[ext_resource path="res://scenes/Railway.tscn" type="PackedScene" id=2]
 [ext_resource path="res://scenes/OrbitCamera.tscn" type="PackedScene" id=3]
+[ext_resource path="res://scenes/OrbitSystem.tscn" type="PackedScene" id=4]
 
 [node name="Main" type="Node2D"]
 
 [node name="DirectionalLight" type="DirectionalLight" parent="."]
 transform = Transform( 0.515898, 0.606099, -0.605386, -0.393123, 0.795389, 0.461314, 0.76112, -2.26831e-08, 0.648611, 0, 0, 0 )
+visible = false
 
-[node name="OrbitCamera" parent="." instance=ExtResource( 3 )]
+[node name="Camera" parent="." instance=ExtResource( 3 )]
 _speed = 0.5
 
-[node name="Railway" parent="." instance=ExtResource( 2 )]
-
-[node name="Train" parent="." instance=ExtResource( 1 )]
-_speed = 5.0
-_railwayPath = NodePath("../Railway")
+[node name="Orbit System" parent="." instance=ExtResource( 4 )]
diff --git a/scripts/orbits/Orbit.cs b/scripts/orbits/Orbit.cs
new file mode 100644
index 0000000..0aca13e
--- /dev/null
+++ b/scripts/orbits/Orbit.cs
@@ -0,0 +1,12 @@
+using Godot;
+using System;
+
+public class Orbit
+{
+    public Orbit(PointMass a, PointMass b)
+    {
+
+    }
+
+    // ellipse
+}
diff --git a/scripts/orbits/OrbitSystem.cs b/scripts/orbits/OrbitSystem.cs
index 358ad53..12e2531 100644
--- a/scripts/orbits/OrbitSystem.cs
+++ b/scripts/orbits/OrbitSystem.cs
@@ -26,7 +26,9 @@ public class OrbitSystem : Node, IMassive, ILocation
 
     public float Mass { get; } = 1;
 
-    private ImmediateGeometry _orbit;
+    private Orbit _orbit;
+
+    private ImmediateGeometry _orbitGeometry;
 
     public override void _Ready()
     {
@@ -39,35 +41,40 @@ public class OrbitSystem : Node, IMassive, ILocation
         DrawOrbit();
     }
 
+    private void InitOrbit()
+    {
+
+    }
+
     private void DrawOrbit()
     {
         int steps = 100;
 
-        _orbit.Clear();
-        _orbit.Begin(Mesh.PrimitiveType.LineLoop);
-        _orbit.SetColor(new Color(1, 0, 0));
+        _orbitGeometry.Clear();
+        _orbitGeometry.Begin(Mesh.PrimitiveType.LineLoop);
+        _orbitGeometry.SetColor(new Color(1, 0, 0));
         for (int i = 0; i < steps; i++)
         {
             float t = i / (float)steps;
             float a = t * Mathf.Tau;
 
-            _orbit.AddVertex(new Vector3
+            _orbitGeometry.AddVertex(new Vector3
             {
                 x = Mathf.Sin(a),
                 z = Mathf.Cos(a)
             });
         }
-        _orbit.End();
+        _orbitGeometry.End();
     }
 
     private void InitGeometry()
     {
-        _orbit = new ImmediateGeometry();
+        _orbitGeometry = new ImmediateGeometry();
         var m = new SpatialMaterial();
         m.VertexColorUseAsAlbedo = true;
         m.FlagsUnshaded = true;
-        _orbit.MaterialOverride = m;
-        AddChild(_orbit);
+        _orbitGeometry.MaterialOverride = m;
+        AddChild(_orbitGeometry);
     }
 
     private void InitPointMasses()
diff --git a/scripts/orbits/Planet.cs b/scripts/orbits/Planet.cs
index c93a33a..877455f 100644
--- a/scripts/orbits/Planet.cs
+++ b/scripts/orbits/Planet.cs
@@ -1,7 +1,7 @@
 using Godot;
 using System;
 
-public class Planet : Node
+public class Planet : Node, IMassive
 {
     [Export]
     public float Mass { get; set; }
diff --git a/scripts/orbits/PointMass.cs b/scripts/orbits/PointMass.cs
index bb277c1..bbeaa14 100644
--- a/scripts/orbits/PointMass.cs
+++ b/scripts/orbits/PointMass.cs
@@ -1,6 +1,6 @@
 using Godot;
 
-struct PointMass : IMassive, ILocation
+public struct PointMass : IMassive, ILocation
 {
     public float Mass => _massive == null ? _mass : _massive.Mass;
     public Vector3 Position => _spatial.Translation;
diff --git a/scripts/orbits/math/Double2.cs b/scripts/orbits/math/Double2.cs
new file mode 100644
index 0000000..942f746
--- /dev/null
+++ b/scripts/orbits/math/Double2.cs
@@ -0,0 +1,8 @@
+using Godot;
+using System;
+
+public struct Double2
+{
+    public double x;
+    public double y;
+}
\ No newline at end of file
diff --git a/scripts/orbits/math/Ellipse.cs b/scripts/orbits/math/Ellipse.cs
new file mode 100644
index 0000000..64751e7
--- /dev/null
+++ b/scripts/orbits/math/Ellipse.cs
@@ -0,0 +1,34 @@
+using Godot;
+using System;
+
+public struct Ellipse
+{
+    public double a { get => SemiMajorAxis; set => SemiMajorAxis = value; }
+    public double SemiMajorAxis { get; set; }
+
+    public double e { get => Eccentricity; set => Eccentricity = value; }
+    public double Eccentricity { get; set; }
+
+    public double b => SemiMajorAxis;
+    public double SemiMinorAxis => Math.Sqrt(Apisides.max * Apisides.min);
+
+    private Apisides Apisides => new Apisides(a, e);
+
+    public Ellipse(double a = 1, double e = 0)
+    {
+        SemiMajorAxis = a;
+        Eccentricity = e;
+    }
+}
+
+public struct Apisides
+{
+    public readonly double min;
+    public readonly double max;
+
+    public Apisides(double a, double e)
+    {
+        min = a * (1 - e);
+        max = a * (1 + e);
+    }
+}
\ No newline at end of file