Initial outline

.gitignore

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+.rbenv-version
+
+Gemfile.lock
+*.gem
+
+.DS_Store
+*.swp
+*.swo

.rspec

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+--colour
+--format documentation

Gemfile

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+source 'https://rubygems.org'
+
+gemspec
+
+gem 'rdoc'
+
+group :test do
+  gem 'rspec'
+end

LICENSE.txt

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+Copyright (c) 2012, Jeffrey C. Reinecke
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+    * Redistributions in binary form must reproduce the above copyright
+      notice, this list of conditions and the following disclaimer in the
+      documentation and/or other materials provided with the distribution.
+    * Neither the name of the copyright holders nor the
+      names of its contributors may be used to endorse or promote products
+      derived from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL JEFFREY REINECKE BE LIABLE FOR ANY
+DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

README.rdoc

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+A library for Kerbal Space Program (KSP) calculation and simulation tools.
+
+All units are mks SI.

Rakefile

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+require 'rdoc/task'
+require 'rspec/core/rake_task'
+
+
+RDoc::Task.new do |rdoc|
+  rdoc.rdoc_dir = 'rdoc'
+  rdoc.rdoc_files.add 'README.rdoc', 'lib/**/.rb', 'LICENSE.txt'
+end
+
+RSpec::Core::RakeTask.new do |spec|
+end

kerbaldyn.gemspec

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+require File.join(File.dirname(__FILE__), 'lib', 'kerbaldyn', 'version')
+
+Gem::Specification.new do |s|
+  s.name = 'kerbaldyn'
+  s.version = KerbalDyn::VERSION
+
+  s.authors = ['Jeff Reinecke']
+  s.email = 'jeff@paploo.net'
+  s.homepage = 'http://www.github.com/paploo/kerbal-dyn'
+  s.summary = 'A library for Kerbal Space Program (KSP) calculation and simulation tools.'
+  s.description = 'A library for Kerbal Space Program (KSP) calculation and simulation tools.'
+  s.licenses = ['BSD']
+
+  s.required_ruby_version = '>=1.9.0'
+  s.require_paths = ['lib']
+  s.files = Dir[
+    'README.rdoc',
+    'Rakefile',
+    'Gemfile',
+    'LICENSE',
+    'lib/**/*',
+    'bin/**/*',
+    'spec/**/*',
+    '.rspec',
+    '*.gemspec'
+  ]
+
+  s.has_rdoc = true
+  s.extra_rdoc_files = ['README.rdoc']
+end

lib/kerbaldyn.rb

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+require 'kerbaldyn/version'
+require 'kerbaldyn/constants'
+require 'kerbaldyn/planet'

lib/kerbaldyn/constants.rb

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+module Kerbal
+
+  # Newton's gravitational constant.
+  G = 6.67300e-11
+
+end

lib/kerbaldyn/version.rb

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+module KerbalDyn
+  class Version
+    MAJOR = 0
+    MINOR = 0
+    TINY  = 1
+
+    def self.to_s
+      return [MAJOR, MINOR, TINY].join('.')
+    end
+  end
+
+  VERSION = Version.to_s
+end

spec/spec_helper.rb

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+require 'rubygems'
+require 'bundler/setup'
+Bundle.load(:test)