diff --git a/docs/notebooks/lightcurve/sinusoidal/sinusoidal_example.ipynb b/docs/notebooks/lightcurve/sinusoidal/sinusoidal_example.ipynb
index 93ec9f9..05e2738 100644
--- a/docs/notebooks/lightcurve/sinusoidal/sinusoidal_example.ipynb
+++ b/docs/notebooks/lightcurve/sinusoidal/sinusoidal_example.ipynb
@@ -41,7 +41,7 @@
     "import pandas as pd\n",
     "\n",
     "data_dict = {\n",
-    "    'FieldMJD_TAI': [60277.351867, 60289.319749, 60289.330920, 60292.334497, 60292.346208],\n",
+    "    'fieldMJD_TAI': [60277.351867, 60289.319749, 60289.330920, 60292.334497, 60292.346208],\n",
     "    'LCA': [1, 1, 1, 1, 1],\n",
     "    'Period': [0.001, 0.001, 0.001, 0.001, 0.001],\n",
     "    'Time0': [60277.351867, 60277.351867, 60277.351867, 60277.351867, 60277.351867],\n",
@@ -69,7 +69,7 @@
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": "sorcha_addons",
+   "display_name": "Python 3 (ipykernel)",
    "language": "python",
    "name": "python3"
   },
@@ -83,9 +83,9 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.10.12"
+   "version": "3.10.13"
   }
  },
  "nbformat": 4,
- "nbformat_minor": 2
+ "nbformat_minor": 4
 }
diff --git a/src/sorcha_addons/lightcurve/sinusoidal/sinusoidal_lightcurve.py b/src/sorcha_addons/lightcurve/sinusoidal/sinusoidal_lightcurve.py
index 2b7008e..9a271f3 100644
--- a/src/sorcha_addons/lightcurve/sinusoidal/sinusoidal_lightcurve.py
+++ b/src/sorcha_addons/lightcurve/sinusoidal/sinusoidal_lightcurve.py
@@ -17,7 +17,7 @@ class SinusoidalLightCurve(AbstractLightCurve):
     * ``Time0`` - phase for the light curve [days].
     """
 
-    def __init__(self, required_column_names: List[str] = ["FieldMJD_TAI", "LCA", "Period", "Time0"]) -> None:
+    def __init__(self, required_column_names: List[str] = ["fieldMJD_TAI", "LCA", "Period", "Time0"]) -> None:
         super().__init__(required_column_names)
 
     def compute(self, df: pd.DataFrame) -> np.array:
@@ -39,7 +39,7 @@ def compute(self, df: pd.DataFrame) -> np.array:
         # Verify that the input data frame contains each of the required columns.
         self._validate_column_names(df)
 
-        time = 2 * np.pi * (df["FieldMJD_TAI"] - df["Time0"]) / df["Period"]
+        time = 2 * np.pi * (df["fieldMJD_TAI"] - df["Time0"]) / df["Period"]
         return df["LCA"] * np.sin(time)
 
     @staticmethod
diff --git a/tests/lightcurve/sinusoidal/test_sinusoidal.py b/tests/lightcurve/sinusoidal/test_sinusoidal.py
index e1cb6bb..37bdee1 100644
--- a/tests/lightcurve/sinusoidal/test_sinusoidal.py
+++ b/tests/lightcurve/sinusoidal/test_sinusoidal.py
@@ -9,7 +9,7 @@ def test_sinusoidal_lightcurve_name():
 
 def test_compute_simple():
     data_dict = {
-        "FieldMJD_TAI": [1.0 / 4],
+        "fieldMJD_TAI": [1.0 / 4],
         "LCA": [1],
         "Period": [1],
         "Time0": [0],