Principia

If you downloaded Lévy before September 13th, 20:58 UTC, you probably have a buggy version (see #4685). Please download it again. If you have the correct version, the version string in the Principia UI says 2026091103-Lévy-0-gc6db14e961191ce8fd931d3302bfa7f7e80d0ecd. We apologize for the inconvenience.

‎Lévy, the September version of Principia, is available, with new features and bug fixes. Download it here for 1.8.1, 1.9.1, 1.10.1, 1.11.0, 1.11.1, 1.11.2, and 1.12.2 to 1.12.5.

For the convenience of Chinese users, download from 腾讯微云: Principia Lévy for 1.8.1—1.12.5.

Principia is a mod for Kerbal Space Program (KSP) which implements N-body and extended body gravitation. Instead of being within the sphere of influence of a single celestial body at any point in time, your vessels are influenced by all the celestials. This makes it possible to implement missions that are more complex and more realistic than in the stock game, especially if used in conjunction with a mod like RealSolarSystem which has real-life celestials.

N-body gravitation is more complex than the toy physics of the stock game. Therefore, before using the mod we recommend that you read the concepts document which explains the most important parts of Principia. In particular, you should learn about the plotting frame and flight planning.

You might also want to go through our tutorial which shows how to go to the Mun with Principia in an energy-efficient manner. We also have a guide explaining how to use the support for rendezvous.

The FAQ explain how to install, how to report bugs and documents the known issues and limitations.

The change log gives a fairly detailed description of the new features in each release.

Principia is released on every new moon with whatever features and bug fixes are ready at the time. This ensures relatively timely improvements and bug fixes.

Download the binary (Ubuntu, macOS, and Windows) here for 1.8.1, 1.9.1, 1.10.1, 1.11.0, 1.11.1, 1.11.2, and 1.12.2 to 1.12.5. Or, if you don't trust our binary, build the mod from the Lévy release.

Name		Name	Last commit message	Last commit date
.github/workflows		.github/workflows
astronomy		astronomy
base		base
benchmark_automation		benchmark_automation
benchmarks		benchmarks
coverage_analyser		coverage_analyser
documentation		documentation
functions		functions
geometry		geometry
graphics		graphics
integrators		integrators
journal		journal
ksp_plugin		ksp_plugin
ksp_plugin_adapter		ksp_plugin_adapter
ksp_plugin_adapter_stub		ksp_plugin_adapter_stub
ksp_plugin_test		ksp_plugin_test
mathematica		mathematica
nanobenchmarks		nanobenchmarks
numerics		numerics
parallel_test_runner		parallel_test_runner
physics		physics
quantities		quantities
serialization		serialization
shared		shared
sourcerer		sourcerer
stacktrace_decoder		stacktrace_decoder
testing_utilities		testing_utilities
tools		tools
.clang-format		.clang-format
.clang-tidy		.clang-tidy
.editorconfig		.editorconfig
.gitattributes		.gitattributes
.gitignore		.gitignore
CONTRIBUTING.md		CONTRIBUTING.md
LICENSE.txt		LICENSE.txt
Makefile		Makefile
Principia C#.slnf		Principia C#.slnf
Principia C++.slnf		Principia C++.slnf
Principia.sln		Principia.sln
Principia.sln.DotSettings		Principia.sln.DotSettings
README.md		README.md
SUPPORT.md		SUPPORT.md
Vagrantfile		Vagrantfile
add_ksp_assemblies_macos.sh		add_ksp_assemblies_macos.sh
boost_config.props		boost_config.props
boost_multiprecision.props		boost_multiprecision.props
common.props		common.props
debug_and_release_in_parallel.xml		debug_and_release_in_parallel.xml
define_ndebug.props		define_ndebug.props
find_msbuild.ps1		find_msbuild.ps1
generate_assembly_info.ps1		generate_assembly_info.ps1
generate_version_translation_unit.props		generate_version_translation_unit.props
generate_version_translation_unit.ps1		generate_version_translation_unit.ps1
generate_version_translation_unit.sh		generate_version_translation_unit.sh
google_abseil-cpp.props		google_abseil-cpp.props
google_benchmark.props		google_benchmark.props
google_gipfeli.props		google_gipfeli.props
google_googlemock_main.props		google_googlemock_main.props
google_googletest.props		google_googletest.props
google_protobuf.props		google_protobuf.props
google_re2.props		google_re2.props
include_solution.props		include_solution.props
include_what_you_using_all_the_things.ps1		include_what_you_using_all_the_things.ps1
inria_core-math.props		inria_core-math.props
install_deps.sh		install_deps.sh
install_iwyu.sh		install_iwyu.sh
iwyu.imp		iwyu.imp
iwyu_generate_mappings.awk		iwyu_generate_mappings.awk
llnl_zfp.props		llnl_zfp.props
lode_lodepng.props		lode_lodepng.props
make_editorconfig.ps1		make_editorconfig.ps1
make_principia_release.ps1		make_principia_release.ps1
principia.props		principia.props
principia.reg		principia.reg
principia_make.sh		principia_make.sh
profiling.props		profiling.props
rebuild_all_solutions.ps1		rebuild_all_solutions.ps1
rebuild_debug_and_release_in_parallel.ps1		rebuild_debug_and_release_in_parallel.ps1
rebuild_release.ps1		rebuild_release.ps1
renamespace_all_the_things.ps1		renamespace_all_the_things.ps1
run_all_third_party_tests.ps1		run_all_third_party_tests.ps1
settings.json		settings.json
suppress_useless_warnings.props		suppress_useless_warnings.props
using_what_you_use.py		using_what_you_use.py

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