Linux/Mac OSX	Windows
Linux GCC 5.3 Linux Clang 3.8 Mac OSX XCode 7.3	MSVC 2015 MSVC 2013 MinGW

OTL is a Modern C++ Orbital Mechanics library for general Keplerian orbit trajectory computation.

This project is very much a work in progress. Feel free to fork and do with it as you like. The license is very liberal. Some of the design and configuration is inspired by SFML.

• Cross-platform (Windows, Linux, Mac OSX)
• Object-oriented C++11
• Epoch system supporting multiple formats (MJD2000, Gregorian, etc.)
• State Vector & Orbital Elements conversions
• Lambert's Problem solver
• Propagation
• Ephemeris
  • Analytical
  • JPL SPICE
  • SGP4
  • MPCORB
• Flybys
• Multiple gravity assist trajectories with deep space maneuvers (MGADSM)
• MATLAB interface
• Well documented
• Unit tested

1. First, acquire the source code by cloning the git repository (these instructions assume you download the source to C:/OTL):

git clone https::/github.com/Jmbryan/OTL.git

2. Download CMake (last built using version 3.5.2 using "cmake-3.5.2-win32-x86.msi")
   • Note: Recommend adding CMake to system path (not done by default in installer)
3. Launch CMake dialog
4. Set source directory to root directory e.g. "C:/OTL"
5. Create a build directory e.g. "C:/OTL/build"
6. Set build directory created in step 5
7. Click Configure
8. Select compiler when prompted (last built using Visual Studio 14 2015)
9. Uncheck the following unless you downloaded the external dependencies (see below)
   • OTL_BUILD_SGP4
   • OTL_BUILD_SPICE
10. Click Generate
11. Open the generated Visual Studio solution file "C:/OTL/build/OTL.sln"
12. Build solution in Debug
13. The built static libraries can be found at "C:/OTL/build/lib".
14. Run the unit tests by opening a command prompt at "C:/OTL/build/bin" and typing "otl-unit-test-d"

1. First, acquire the source code by cloning the git repository (these instructions assume you download the source to /Users/username/OTL):

git clone https::/github.com/Jmbryan/OTL.git

2. Download CMake (last built using version 3.5.2 using "cmake-3.5.2-Darwin-x86_64.dmg")
3. Launch CMake dialog
4. Set source directory to root directory e.g. "/Users/username/OTL"
5. Create a build directory e.g. "/Users/username/OTL/build"
6. Set build directory created in step 5
7. Click Configure
8. Select compiler when prompted (last built using XCode 7.3)
9. Uncheck the following unless you downloaded the external dependencies (see below)
   • OTL_BUILD_SGP4
   • OTL_BUILD_SPICE
10. Click Generate
11. Open the generated XCode project "/Users/username/OTL/build/OTL.xcode"
12. Build solution in Debug
13. The built static libraries can be found at "/Users/username/OTL/build/lib".
14. Run the unit tests by opening a command prompt at "/Users/username/OTL/build/bin" and typing "otl-unit-test-d"

• Eigen (v3.2.8)
• Spdlog
• niek-ephem
• Catch (v1.5.6)
• FakeIt (v2.0.2)

• CSPICE (last tested using "PC, Windows, MS Visual C, 32bit")
• SGP4 (source is located at the bottom of the page)

• Jason Bryan - main developer (Jmbryan10@gmail.com)