Fix copyright

teubert · teubert · commit 464bae101796 · 2023-08-20T15:32:21.000-07:00
diff --git a/tests/test_horizon.py b/tests/test_horizon.py
@@ -1,3 +1,6 @@
+# Copyright © 2021 United States Government as represented by the Administrator of the
+# National Aeronautics and Space Administration.  All Rights Reserved.
+
 from io import StringIO
 import sys
 import unittest
