support corrected spin start times (use_corrected_spin_start flag)

.github/workflows/test.yml

@@ -14,6 +14,9 @@ jobs:
       matrix:
         os: [windows-latest, ubuntu-latest, macos-latest]
         python-version: ['3.10', '3.11', '3.12', '3.13', '3.14']
+    env:
+      # External test data is only downloaded (and cached) on this one runner
+      USE_EXTERNAL_DATA: ${{ contains(matrix.os, 'ubuntu') && matrix.python-version == '3.10' }}
     defaults:
       run:
         shell: bash
@@ -44,7 +47,7 @@ jobs:
         uses: actions/cache@v6
         # We only download data on this runner, so only cache data from this run
         # so we don't get an empty cache on other runners overriding that data
-        if: ${{ contains(matrix.os, 'ubuntu') && matrix.python-version == '3.10' }}
+        if: env.USE_EXTERNAL_DATA == 'true'
         with:
           path: |
             **/data/
@@ -53,10 +56,15 @@ jobs:
           restore-keys: |
             cdf-data-
 
+      - name: Restore tracked files overwritten by the cache
+        # A fallback restore via restore-keys can bring back stale copies of
+        # git-tracked files under data/ and test_data/; reset them to the
+        # checked-out versions while keeping the untracked downloaded data.
+        if: env.USE_EXTERNAL_DATA == 'true'
+        run: git checkout -- .
+
       - name: Testing
         id: test
-        env:
-          USE_EXTERNAL_DATA: ${{ contains(matrix.os, 'ubuntu') && matrix.python-version == '3.10' }}
         run: |
           # Ignore the network marks from the remote test environment
           if [ "$USE_EXTERNAL_DATA" = "true" ]; then

imap_processing/glows/l1b/glows_l1b_data.py

@@ -995,7 +995,7 @@ def update_spice_parameters(self, spin_offset_correction: float = 0.0) -> None:
 
         # Calculate spin period
         # ---------------------
-        spin_data = get_spin_data()
+        spin_data = get_spin_data(use_corrected_spin_start=False)
         # select spin data within the range from data start time to end time
         spin_data = spin_data[
             (spin_data["spin_start_met"] >= data_start_met)
@@ -1009,7 +1009,9 @@ def update_spice_parameters(self, spin_offset_correction: float = 0.0) -> None:
         # --------------------------------
         angle_offset = 360 - get_spin_angle(
             get_instrument_spin_phase(
-                self.imap_start_time, instrument=geometry.SpiceFrame.IMAP_GLOWS
+                self.imap_start_time,
+                instrument=geometry.SpiceFrame.IMAP_GLOWS,
+                use_corrected_spin_start=False,
             ),
             degrees=True,
         )