diff --git a/workflow/scripts/satellite-overpass-identification-tool/pass_time_cylc.py b/workflow/scripts/satellite-overpass-identification-tool/pass_time_cylc.py
index 9bcb637f..f6f2fb2e 100644
--- a/workflow/scripts/satellite-overpass-identification-tool/pass_time_cylc.py
+++ b/workflow/scripts/satellite-overpass-identification-tool/pass_time_cylc.py
@@ -4,7 +4,6 @@
 #   "requests==2.31.0",
 #   "skyfield==1.45.0",
 #   "numpy==1.26",
-#   "typer"
 # ]
 # ///
 
@@ -34,9 +33,6 @@
 import numpy as np
 import csv
 import math
-import typer
-import pathlib
-from typing_extensions import Annotated
 
 # URLs for space track login.
 uriBase = "https://www.space-track.org"
@@ -332,80 +328,61 @@ def find_closest_pass(passes, ascending=True):
     return aqua_closest, terra_closest
 
 
-app = typer.Typer()
-
-
-@app.command()
-def main(
-    SPACEUSER: Annotated[
-        str, 
-        typer.Option(
-            "--SPACEUSER", 
-            "-u", 
-            help="space-track.org username")
-    ],
-    SPACEPSWD: Annotated[
-        str,
-        typer.Option(
-            "--SPACEPSWD",
-            "-p",
-            help="space-track.org password",
-        ),
-    ],
-    start_date: Annotated[
-        str,
-        typer.Option(
-            "--startdate",
-            help="Start date in format YYYY-MM-DD",
-            metavar="YYYY-MM-DD",
-            parser=_parsedate,
-        ),
-    ],
-    end_date: Annotated[
-        str,
-        typer.Option(
-            "--enddate",
-            help="End date in format YYYY-MM-DD",
-            metavar="YYYY-MM-DD",
-            parser=_parsedate,
-        ),
-    ],
-    lat: Annotated[
-        float,
-        typer.Option(
-            "--centroid-lat",
-            "--lat",
-            help="latitude of bounding box centroid",
-        ),
-    ],
-    lon: Annotated[
-        float,
-        typer.Option(
-            "--centroid-lon",
-            "--lon",
-            help="longitude of bounding box centroid",
-        ),
-    ],
-    csvoutpath: Annotated[
-        pathlib.Path,
-        typer.Option(
-            "--csvoutpath",
-            help="Path to output CSV file",
-        ),
-    ],
-):
-    """Aqua and Terra Satellite Overpass time tool"""
-
-    get_passtimes(
-        start_date=start_date,
-        end_date=end_date,
-        csvoutpath=csvoutpath,
-        lat=lat,
-        lon=lon,
-        SPACEUSER=SPACEUSER,
-        SPACEPSWD=SPACEPSWD,
+
+def main():
+    parser = argparse.ArgumentParser(
+        description="Aqua and Terra Satellite Overpass time tool"
+    )
+    parser.add_argument(
+        "--SPACEUSER",
+        "-u",
+        type=str,
+        help="space-track.org username",
+    )
+    parser.add_argument(
+        "--SPACEPSWD",
+        "-p",
+        type=str,
+        help="space-track.org password",
+    )
+    parser.add_argument(
+        "--startdate",
+        type=_parsedate,
+        dest="start_date",
+        help="Start date in format YYYY-MM-DD",
+    )
+    parser.add_argument(
+        "--enddate",
+        type=_parsedate,
+        dest="end_date",
+        help="End date in format YYYY-MM-DD",
     )
+    parser.add_argument(
+        "--centroid-lat",
+        "--lat",
+        metavar="lat",
+        dest="lat",
+        type=float,
+        help="latitude of bounding box centroid",
+    )
+    parser.add_argument(
+        "--centroid-lon",
+        "--lon",
+        metavar="lon",
+        dest="lon",
+        type=float,
+        help="longitude of bounding box centroid",
+    )
+    parser.add_argument(
+        "--csvoutpath",
+        type=str,
+        help="Path to output CSV file",
+    )
+
+    args = parser.parse_args()
+
+    get_passtimes(**vars(args))
 
 
 if __name__ == "__main__":
-    app()
+    main()
\ No newline at end of file