diff --git a/src/app/App.tsx b/src/app/App.tsx
index 0af1e42b..692556a8 100644
--- a/src/app/App.tsx
+++ b/src/app/App.tsx
@@ -9304,7 +9304,7 @@ export function App({ store, initialStatusMessage }: AppProps) {
                     </label>
                   </div>
                   <div className="material-summary">
-                    Default is 24 real minutes for one full 24-hour cycle. Daylight uses each scene's authored World settings as the daytime baseline.
+                    Default is 24 real minutes for one full 24-hour cycle.
                   </div>
                 </div>
 
@@ -9453,471 +9453,12 @@ export function App({ store, initialStatusMessage }: AppProps) {
                     </label>
                   </div>
                   <div className="material-summary">
-                    Sunrise must stay earlier than sunset. Dawn and dusk durations define how broadly the twilight profile blends around each boundary.
+                    Sunrise must stay earlier than sunset. Dawn and dusk durations define how broadly the twilight transition blends around each boundary.
                   </div>
                 </div>
 
-                <div className="form-section">
-                  <div className="label">Dawn Profile</div>
-                  <div className="vector-inputs">
-                    <label className="form-field">
-                      <span className="label">Sky Top</span>
-                      <input
-                        className="color-input"
-                        type="color"
-                        value={editorState.projectDocument.time.dawn.skyTopColorHex}
-                        onChange={(event) =>
-                          applyProjectTimePhaseColor(
-                            "dawn",
-                            "skyTopColorHex",
-                            event.currentTarget.value,
-                            "Set dawn sky top color",
-                            "Updated the dawn sky top color."
-                          )
-                        }
-                      />
-                    </label>
-                    <label className="form-field">
-                      <span className="label">Sky Bottom</span>
-                      <input
-                        className="color-input"
-                        type="color"
-                        value={editorState.projectDocument.time.dawn.skyBottomColorHex}
-                        onChange={(event) =>
-                          applyProjectTimePhaseColor(
-                            "dawn",
-                            "skyBottomColorHex",
-                            event.currentTarget.value,
-                            "Set dawn sky bottom color",
-                            "Updated the dawn sky bottom color."
-                          )
-                        }
-                      />
-                    </label>
-                    <label className="form-field">
-                      <span className="label">Ambient Color</span>
-                      <input
-                        className="color-input"
-                        type="color"
-                        value={editorState.projectDocument.time.dawn.ambientColorHex}
-                        onChange={(event) =>
-                          applyProjectTimePhaseColor(
-                            "dawn",
-                            "ambientColorHex",
-                            event.currentTarget.value,
-                            "Set dawn ambient color",
-                            "Updated the dawn ambient color."
-                          )
-                        }
-                      />
-                    </label>
-                    <label className="form-field">
-                      <span className="label">Ambient Factor</span>
-                      <input
-                        className="text-input"
-                        type="number"
-                        min="0"
-                        step="0.05"
-                        value={projectTimeDawnAmbientIntensityFactorDraft}
-                        onChange={(event) =>
-                          setProjectTimeDawnAmbientIntensityFactorDraft(
-                            event.currentTarget.value
-                          )
-                        }
-                        onBlur={() =>
-                          applyProjectTimePhaseNumericField(
-                            "dawn",
-                            "ambientIntensityFactor",
-                            projectTimeDawnAmbientIntensityFactorDraft,
-                            "Set dawn ambient factor",
-                            "Dawn ambient factor",
-                            "Updated the dawn ambient factor."
-                          )
-                        }
-                      />
-                    </label>
-                    <label className="form-field">
-                      <span className="label">Light Color</span>
-                      <input
-                        className="color-input"
-                        type="color"
-                        value={editorState.projectDocument.time.dawn.lightColorHex}
-                        onChange={(event) =>
-                          applyProjectTimePhaseColor(
-                            "dawn",
-                            "lightColorHex",
-                            event.currentTarget.value,
-                            "Set dawn light color",
-                            "Updated the dawn light color."
-                          )
-                        }
-                      />
-                    </label>
-                    <label className="form-field">
-                      <span className="label">Light Factor</span>
-                      <input
-                        className="text-input"
-                        type="number"
-                        min="0"
-                        step="0.05"
-                        value={projectTimeDawnLightIntensityFactorDraft}
-                        onChange={(event) =>
-                          setProjectTimeDawnLightIntensityFactorDraft(
-                            event.currentTarget.value
-                          )
-                        }
-                        onBlur={() =>
-                          applyProjectTimePhaseNumericField(
-                            "dawn",
-                            "lightIntensityFactor",
-                            projectTimeDawnLightIntensityFactorDraft,
-                            "Set dawn light factor",
-                            "Dawn light factor",
-                            "Updated the dawn light factor."
-                          )
-                        }
-                      />
-                    </label>
-                  </div>
-                </div>
-
-                <div className="form-section">
-                  <div className="label">Dusk Profile</div>
-                  <div className="vector-inputs">
-                    <label className="form-field">
-                      <span className="label">Sky Top</span>
-                      <input
-                        className="color-input"
-                        type="color"
-                        value={editorState.projectDocument.time.dusk.skyTopColorHex}
-                        onChange={(event) =>
-                          applyProjectTimePhaseColor(
-                            "dusk",
-                            "skyTopColorHex",
-                            event.currentTarget.value,
-                            "Set dusk sky top color",
-                            "Updated the dusk sky top color."
-                          )
-                        }
-                      />
-                    </label>
-                    <label className="form-field">
-                      <span className="label">Sky Bottom</span>
-                      <input
-                        className="color-input"
-                        type="color"
-                        value={editorState.projectDocument.time.dusk.skyBottomColorHex}
-                        onChange={(event) =>
-                          applyProjectTimePhaseColor(
-                            "dusk",
-                            "skyBottomColorHex",
-                            event.currentTarget.value,
-                            "Set dusk sky bottom color",
-                            "Updated the dusk sky bottom color."
-                          )
-                        }
-                      />
-                    </label>
-                    <label className="form-field">
-                      <span className="label">Ambient Color</span>
-                      <input
-                        className="color-input"
-                        type="color"
-                        value={editorState.projectDocument.time.dusk.ambientColorHex}
-                        onChange={(event) =>
-                          applyProjectTimePhaseColor(
-                            "dusk",
-                            "ambientColorHex",
-                            event.currentTarget.value,
-                            "Set dusk ambient color",
-                            "Updated the dusk ambient color."
-                          )
-                        }
-                      />
-                    </label>
-                    <label className="form-field">
-                      <span className="label">Ambient Factor</span>
-                      <input
-                        className="text-input"
-                        type="number"
-                        min="0"
-                        step="0.05"
-                        value={projectTimeDuskAmbientIntensityFactorDraft}
-                        onChange={(event) =>
-                          setProjectTimeDuskAmbientIntensityFactorDraft(
-                            event.currentTarget.value
-                          )
-                        }
-                        onBlur={() =>
-                          applyProjectTimePhaseNumericField(
-                            "dusk",
-                            "ambientIntensityFactor",
-                            projectTimeDuskAmbientIntensityFactorDraft,
-                            "Set dusk ambient factor",
-                            "Dusk ambient factor",
-                            "Updated the dusk ambient factor."
-                          )
-                        }
-                      />
-                    </label>
-                    <label className="form-field">
-                      <span className="label">Light Color</span>
-                      <input
-                        className="color-input"
-                        type="color"
-                        value={editorState.projectDocument.time.dusk.lightColorHex}
-                        onChange={(event) =>
-                          applyProjectTimePhaseColor(
-                            "dusk",
-                            "lightColorHex",
-                            event.currentTarget.value,
-                            "Set dusk light color",
-                            "Updated the dusk light color."
-                          )
-                        }
-                      />
-                    </label>
-                    <label className="form-field">
-                      <span className="label">Light Factor</span>
-                      <input
-                        className="text-input"
-                        type="number"
-                        min="0"
-                        step="0.05"
-                        value={projectTimeDuskLightIntensityFactorDraft}
-                        onChange={(event) =>
-                          setProjectTimeDuskLightIntensityFactorDraft(
-                            event.currentTarget.value
-                          )
-                        }
-                        onBlur={() =>
-                          applyProjectTimePhaseNumericField(
-                            "dusk",
-                            "lightIntensityFactor",
-                            projectTimeDuskLightIntensityFactorDraft,
-                            "Set dusk light factor",
-                            "Dusk light factor",
-                            "Updated the dusk light factor."
-                          )
-                        }
-                      />
-                    </label>
-                  </div>
-                </div>
-
-                <div className="form-section">
-                  <div className="label">Night Profile</div>
-                  <div className="vector-inputs">
-                    <label className="form-field">
-                      <span className="label">Sky Top</span>
-                      <input
-                        className="color-input"
-                        type="color"
-                        value={editorState.projectDocument.time.night.skyTopColorHex}
-                        onChange={(event) =>
-                          applyProjectTimePhaseColor(
-                            "night",
-                            "skyTopColorHex",
-                            event.currentTarget.value,
-                            "Set night sky top color",
-                            "Updated the night sky top color."
-                          )
-                        }
-                      />
-                    </label>
-                    <label className="form-field">
-                      <span className="label">Sky Bottom</span>
-                      <input
-                        className="color-input"
-                        type="color"
-                        value={editorState.projectDocument.time.night.skyBottomColorHex}
-                        onChange={(event) =>
-                          applyProjectTimePhaseColor(
-                            "night",
-                            "skyBottomColorHex",
-                            event.currentTarget.value,
-                            "Set night sky bottom color",
-                            "Updated the night sky bottom color."
-                          )
-                        }
-                      />
-                    </label>
-                    <label className="form-field">
-                      <span className="label">Ambient Color</span>
-                      <input
-                        className="color-input"
-                        type="color"
-                        value={editorState.projectDocument.time.night.ambientColorHex}
-                        onChange={(event) =>
-                          applyProjectTimePhaseColor(
-                            "night",
-                            "ambientColorHex",
-                            event.currentTarget.value,
-                            "Set night ambient color",
-                            "Updated the night ambient color."
-                          )
-                        }
-                      />
-                    </label>
-                    <label className="form-field">
-                      <span className="label">Ambient Factor</span>
-                      <input
-                        className="text-input"
-                        type="number"
-                        min="0"
-                        step="0.05"
-                        value={projectTimeNightAmbientIntensityFactorDraft}
-                        onChange={(event) =>
-                          setProjectTimeNightAmbientIntensityFactorDraft(
-                            event.currentTarget.value
-                          )
-                        }
-                        onBlur={() =>
-                          applyProjectTimePhaseNumericField(
-                            "night",
-                            "ambientIntensityFactor",
-                            projectTimeNightAmbientIntensityFactorDraft,
-                            "Set night ambient factor",
-                            "Night ambient factor",
-                            "Updated the night ambient factor."
-                          )
-                        }
-                      />
-                    </label>
-                    <label className="form-field">
-                      <span className="label">Moon / Night Light</span>
-                      <input
-                        className="color-input"
-                        type="color"
-                        value={editorState.projectDocument.time.night.lightColorHex}
-                        onChange={(event) =>
-                          applyProjectTimePhaseColor(
-                            "night",
-                            "lightColorHex",
-                            event.currentTarget.value,
-                            "Set night light color",
-                            "Updated the night light color."
-                          )
-                        }
-                      />
-                    </label>
-                    <label className="form-field">
-                      <span className="label">Moon / Night Factor</span>
-                      <input
-                        className="text-input"
-                        type="number"
-                        min="0"
-                        step="0.05"
-                        value={projectTimeNightLightIntensityFactorDraft}
-                        onChange={(event) =>
-                          setProjectTimeNightLightIntensityFactorDraft(
-                            event.currentTarget.value
-                          )
-                        }
-                        onBlur={() =>
-                          applyProjectTimePhaseNumericField(
-                            "night",
-                            "lightIntensityFactor",
-                            projectTimeNightLightIntensityFactorDraft,
-                            "Set night light factor",
-                            "Night light factor",
-                            "Updated the night light factor."
-                          )
-                        }
-                      />
-                    </label>
-                  </div>
-                  <div className="form-section">
-                    <div className="label">Night Background Image</div>
-                    <label className="form-field">
-                      <span className="label">Image</span>
-                      <select
-                        className="text-input"
-                        value={
-                          editorState.projectDocument.time.nightBackground
-                            .assetId ?? ""
-                        }
-                        onChange={(event) =>
-                          applyProjectTimeNightBackgroundAssetId(
-                            event.currentTarget.value.trim().length === 0
-                              ? null
-                              : event.currentTarget.value
-                          )
-                        }
-                      >
-                        <option value="">None</option>
-                        {imageAssetList.map((asset) => (
-                          <option key={asset.id} value={asset.id}>
-                            {asset.sourceName}
-                          </option>
-                        ))}
-                      </select>
-                    </label>
-                    {editorState.projectDocument.time.nightBackground.assetId ===
-                    null ? (
-                      imageAssetList.length === 0 ? (
-                        <div className="material-summary">
-                          Import an image asset to author a dedicated night sky image.
-                        </div>
-                      ) : (
-                        <div className="material-summary">
-                          Night falls back to the blended dawn/dusk/night sky colors until an image is selected.
-                        </div>
-                      )
-                    ) : (
-                      <>
-                        <label className="form-field">
-                          <span className="label">Environment Intensity</span>
-                          <input
-                            className="text-input"
-                            type="number"
-                            min="0"
-                            step="0.1"
-                            value={
-                              projectTimeNightBackgroundEnvironmentIntensityDraft
-                            }
-                            onChange={(event) =>
-                              setProjectTimeNightBackgroundEnvironmentIntensityDraft(
-                                event.currentTarget.value
-                              )
-                            }
-                            onBlur={
-                              applyProjectTimeNightBackgroundEnvironmentIntensity
-                            }
-                            onKeyDown={(event) =>
-                              handleDraftVectorKeyDown(
-                                event,
-                                applyProjectTimeNightBackgroundEnvironmentIntensity
-                              )
-                            }
-                            onKeyUp={(event) =>
-                              handleNumberInputKeyUp(
-                                event,
-                                applyProjectTimeNightBackgroundEnvironmentIntensity
-                              )
-                            }
-                            onPointerUp={(event) =>
-                              handleNumberInputPointerUp(
-                                event,
-                                applyProjectTimeNightBackgroundEnvironmentIntensity
-                              )
-                            }
-                          />
-                        </label>
-                        <div className="material-summary">
-                          {editorState.document.assets[
-                            editorState.projectDocument.time.nightBackground
-                              .assetId
-                          ]?.sourceName ??
-                            editorState.projectDocument.time.nightBackground
-                              .assetId}
-                        </div>
-                      </>
-                    )}
-                  </div>
-                  <div className="material-summary">
-                    Dawn, dusk, and night profiles blend over each scene's authored World settings whenever the scene enables global time influence.
-                  </div>
+                <div className="material-summary">
+                  Environment authoring lives in World. Project Time now only defines the shared clock and daylight window.
                 </div>
               </Panel>