RubySunrise Gem

As a follow-up to the Java sunrise/sunset calculator I released early last year, I’m releasing a ruby gem that does essentially the same thing. Just in A LOT less code, but with the same attention to test goodness.

To install and use the RubySunrise gem just:

$ gem install RubySunrise

or download from RubyGems.

The current version as of today is 0.2, which requires the tzinfo gem to perform the timezone offset lookups.

If you want/need the lastest, just grab it from the github repo:

require ‘solareventcalculator’

date = Date.parse(‘2008-11-01’) calc =,“39.9537”),“-75.7850”))

utcOfficialSunrise = calc.compute_utc_official_sunrise localOfficialSunrise = calc.compute_official_sunrise(‘America/New_York’)

puts “utcOfficialSunrise #{utcOfficialSunrise}” puts “localOfficialSunrise #{localOfficialSunrise}”

Which yields:

utcOfficialSunrise 2008-11-01T11:33:00+00:00
localOfficialSunrise 2008-11-01T07:33:00-04:00

The source is available under the Apache License, Version 2.0 at Github