equationoftime

Home: equationoftime.herokuapp.com/
Code: github.com/DouglasAllen/equationoftime
RDoc: rubydoc.info/gems/equationoftime/4.1.5/frames
Issues: github.com/DouglasAllen/equationoftime/issues

DESCRIPTION:

Calculate Sunrise and Sunset. Now uses native C wrappers. Lots of examples to play with for learning about Eot.

FEATURES/PROBLEMS:

Use GeoLatLng class to set coordinates or set them manually.

SYNOPSIS:

$ irb --simple-prompt

      require 'eot'
      eot = Eot.new
      eot.string_eot          # todays eot
      eot.ajd                 # was initialized to noon today ei. jd
      # Try the real AJD
      eot.ajd = DateTime.now.to_time.utc.to_datetime.ajd.to_f

      eot.string_eot          # nothing changes so...
      eot.ma_ta_set           # recalculate ma and ta after initialization
      eot.string_eot          # should be different than before

      # check and set a new address                        
      geo = GeoLatLng.new
      geo.addr
      geo.addr = "houston, tx"     # set new location
      geo.set_coordinates          # set new coordinates
      eot.latitude = geo.lat       # set the Eot class attributes
      eot.longitude = geo.lng

      # Be shure you have the date set right
      eot.ajd = DateTime.new(2014,11,07).to_time.utc.to_datetime.jd.to_f

      eot.ma_ta_set           # recalculate ma and ta after initialization

      eot.sunrise_jd          # the dates sunrise as a jd
      eot.sunset_jd           # the dates sunset as a jd
      eot.sunrise_dt          # the dates sunrise as DateTime
      eot.sunset_dt           # the dates sunset as a DateTime

      eot.ajd += 1            # the days after times can be read
      eot.ma_ta_set           # recalculate ma and ta after initialization 
      eot.ajd = 2451545       # ajd set to 2001-01-01 12:00

Gem patch:

$ gem install eot

After realizing this name was available I decided to use it. It installs the needed requirements as for some reason gem install equationoftime doesn’t always. Hoe hoe hoe!

REQUIREMENTS:

$ bundle install

INSTALL:

$ bundle exec rake install

DEVELOPERS:

After checking out the source, run:

$ bundle exec rake newb

This task will install any missing dependencies, run the tests/specs, and generate the RDoc.

LICENSE:

(The MIT License)

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the ‘Software’), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED ‘AS IS’, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.