Lunartic

Calculate the approximate phase of the moon on a given date.

Note: Calculations are currently very approximate and will be improved shortly.

Installation

Add this line to your application's Gemfile:

gem 'lunartic'

And then execute:

$ bundle

Or install it yourself as:

$ gem install lunartic

Usage

You can get the day (day within a cycle, 0..28), percent_full (0..1), and phase (a symbol) of the moon on a given day like so:

irb(main):001:0> require 'lunartic'
  => true

# get moon data for today
irb(main):002:0> moon = Lunartic.today
  => #<Lunartic::Moon:0x007fa5028e4dc0 @date=#<Date: 2014-06-25 ((2456834j,0s,0n),+0s,2299161j)>>
irb(main):003:0> moon.day
  => 27
irb(main):004:0> moon.phase
  => :waning_crescent
irb(main):005:0> moon.percent_full
  => 0.17138763236974325

# or, get moon data for a given Date
irb(main):006:0> Lunartic.on_date(Date.new(1989, 12, 28)).phase
  => :new

Testing

$ rake spec

Contributing

1. Fork it
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create new Pull Request