This program uses the libraries provided by Daniel Warner's sgp4 library, you can see the source code at his github repository, and you can learn more about it on his website, https://www.danrw.com/sgp4/.
The SGP4 Library:
Copyright 2017 Daniel Warner
Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.
Note that Daniel Warner's example code located at his github repository was used as an example for creating some of the algroithms in this program.
The SPACEHAUC implementation of the SGP4 library:
Copyright 2018 SPACEHAUC Groundstation Team
Licensed under the GNU General Public License version 3.0.
