license, cleanup, thread

README.md

@@ -70,9 +70,14 @@ Upstream Celestia:
 
 * https://github.com/CelestiaProject/Celestia
 
+Celestia forum thread about celestia-gnss:
+
+* https://celestia.space/forum/viewtopic.php?f=6&t=22559
+
 ## TLE Conversion
 
-TLE Conversion Spreadsheet by Grant Hutchison from July 2003.
+TLE Conversion Spreadsheet by Grant Hutchison from July 2003,
+the basis for the formulas in the `tle2ssc` script.
 
 * https://www.classe.cornell.edu/~seb/celestia/hutchison/spreadsheets.html
 
@@ -120,9 +125,11 @@ Example `.ssc` file contents:
 }
 ```
 
-
 ## TLE Sources
 
+GNSS (All)
+* https://celestrak.com/NORAD/elements/gnss.txt
+
 Beidou (China)
 * https://celestrak.com/NORAD/elements/beidou.txt
 
@@ -132,9 +139,6 @@ Galileo (Europe)
 Glonass (Russia)
 * https://celestrak.com/NORAD/elements/glo-ops.txt
 
-GNSS (All)
-* https://celestrak.com/NORAD/elements/gnss.txt
-
 GPS (USA)
 * https://celestrak.com/NORAD/elements/gps-ops.txt
 

tle2ssc

@@ -1,7 +1,25 @@
 #!/usr/bin/python3
-# tle2ssc
-# Convert a TLE into an .ssc file for Celestia
-#
+"""
+                                tle2ssc
+    Convert TLE orbit to Solar System Catalog (SSC) format for Celestia.
+
+    Copyright (C) 2022, Jeff Moe, jebba.
+    Authors: Jeff Moe
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program. If not, see <https://www.gnu.org/licenses/>.
+"""
+
 # Usage:
 # tle2ssc
 # Example: