MkCoord

Introduction

This is the gem library which converts coordinates.

Computable items

• Rectangular position:
  • Equator coordinates -> Ecliptic coordinates [x, y, z]
  • Ecliptic coordinates -> Equator coordinates [x, y, z]
• Polar position:
  • Equator coordinates -> Ecliptic coordinates [lambda, beta]
  • Ecliptic coordinates -> Equator coordinates [alpha, delta]
• Rectangular coordinates -> Polar coordinates [lambda, phi, r]
• Polar coordinates -> Rectangular coordinates [x, y, z]

Installation

Add this line to your application's Gemfile:

gem 'mk_coord'

And then execute:

$ bundle

Or install it yourself as:

$ gem install mk_coord

Usage

require 'mk_coord'

eps = 0.409
pos_rect = [
   0.99443659220700997281,
  -0.03816291768957833647,
  -0.01655177670960058384
]
pos_pol  = [
   6.24482770879939,
  -0.016630599800372015
]
r = 0.9951686008947793
p pos_rect
p pos_pol
p r
puts "---"
p MkCoord.rect_eq2ec(pos_rect, eps)
p MkCoord.rect_ec2eq(pos_rect, eps)
p MkCoord.pol_eq2ec(pos_pol, eps)
p MkCoord.pol_ec2eq(pos_pol, eps)
p MkCoord.rect2pol(pos_rect)
p MkCoord.pol2rect(pos_pol, r)

About the units:

• The unit of epsilon(eps) should be radian.
• The unit of polar postion(pos_pol) should be radian.
• Everything is good for the unit of rectangular postion(pos_pol).
• Everything is good for the unit of distance(r).

Development

After checking out the repo, run bin/setup to install dependencies. Then, run rake spec to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/komasaru/mk_coord.

License

The gem is available as open source under the terms of the MIT License.