MkGreenwich

This is the gem library which calculates Greenwich time.

gem 'mk_greenwich'

And then execute:

$ bundle

Or install it yourself as:

$ gem install mk_greenwich

require 'mk_greenwich'

g = MkGreenwich.new("20160906")
g = MkGreenwich.new("20160906123456")
g = MkGreenwich.new

• You can set UTC formatted "YYYYMMDD" or "YYYYMMDDHHMMSS" as an argument.
• If you don't set an argument, this class considers the system time to have been set as an argument.

puts " UTC: #{g.utc.instance_eval { '%s.%03d' % [strftime('%Y-%m-%d %H:%M:%S'), (usec / 1000.0).round] }}"
puts "  TT: #{g.tt.instance_eval { '%s.%03d' % [strftime('%Y-%m-%d %H:%M:%S'), (usec / 1000.0).round] }}"
puts " UT1: #{g.ut1.instance_eval { '%s.%03d' % [strftime('%Y-%m-%d %H:%M:%S'), (usec / 1000.0).round] }}"
puts " TDB: #{g.tdb.instance_eval { '%s.%03d' % [strftime('%Y-%m-%d %H:%M:%S'), (usec / 1000.0).round] }}"
puts " ERA: #{g.era}"
puts "  EO: #{g.eo}"
puts "GAST: #{g.gast} rad"
puts "    = #{g.gast_deg} °"
puts "    = #{g.gast_hms}"
puts "GMST: #{g.gmst} rad"
puts "    = #{g.gmst_deg} °"
puts "    = #{g.gmst_hms}"
puts "  EE: #{g.ee} rad"
puts "    = #{g.ee_deg} °"
puts "    = #{g.ee_hms}"

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.

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

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