This is the gem library which calculates rise/set/meridian_passage of Sun and Moon.(Timezone: JST)
Sunrise(time, azimuth), Sunset(time, azimuth), Sun's meridian passage(time, altitude), Moorise(time, azimuth), Moonset(time, azimuth), Moon's meridian passage(time, altitude),
「日の出・日の入りの計算―天体の出没時刻の求め方」（長沢 工 著）
Add this line to your application's Gemfile:
gem 'mk_sunmoon'And then execute:
$ bundle
Or install it yourself as:
$ gem install mk_sunmoon
require 'mk_sunmoon'
o = MkSunmoon.new("20160613", 35.47222222, 133.05055556, 0)
exit unless o
p o.year # => 2016
p o.month # => 6
p o.day # => 13
p o.lat # => 35.47222222
p o.lon # => 133.05055556
p o.alt # => 0.0
p o.sunrise # => ["04:51:52", 60.3625538738466]
p o.sunset # => ["19:23:59", 299.679632987787]
p o.sun_mp # => ["12:07:52", 77.75865299128155]
p o.moonrise # => ["12:48:14", 89.56165470119508]
p o.moonset # => ["00:32:24", 272.8282647107956]
p o.moon_mp # => ["18:58:52", 54.1049869601976]When latitude and longitude which you set as arguments are formats like 999°99′99.999″, You must convert degree formats like 999.9999°. (e.g. 35°28′20″ -> 35.47222222°)
If times and azimuth of Sunrise, Sunset are --:--:-- and ---, it means that those are "night of the midnight sun" or "polar night".
If times of Moonrise, Moonset, Moon Meridian Passase are --:--:--, it means that those phenomenons are occurred in the target date.
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. Run bundle exec mk_sunmoon to use the gem in this directory, ignoring other installed copies of this gem.
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.
Bug reports and pull requests are welcome on GitHub at https://github.com/komasaru/mk_sunmoon.
The gem is available as open source under the terms of the MIT License.