Module: Timely::Astronomy

Defined in:
lib/timely/astronomy.rb

Constant Summary collapse

PHASE_NAMES = 
[
  'New Moon', 'Waxing Crescent', 'First Quarter', 'Waxing Gibbous',
  'Full Moon', 'Waning Gibbous', 'Last Quarter', 'Waning Crescent'
].freeze
PHASE_SYMBOLS = 
[
  "\u{1F311}", "\u{1F312}", "\u{1F313}", "\u{1F314}",
  "\u{1F315}", "\u{1F316}", "\u{1F317}", "\u{1F318}"
].freeze
PLANET_SYMBOLS = 
{
  'mercury' => "\u263F", 'venus' => "\u2640", 'mars' => "\u2642",
  'jupiter' => "\u2643", 'saturn' => "\u2644"
}.freeze
BODY_COLORS =

RGB colors matching astropanel

{
  'sun'     => 'FFD700',
  'moon'    => '888888',
  'mercury' => '8F6E54',
  'venus'   => 'E6B07C',
  'mars'    => 'BC2732',
  'jupiter' => 'C08040',
  'saturn'  => 'E8D9A0'
}.freeze

Class Method Summary collapse

Class Method Details

.astro_events(date, lat = 59.9139, lon = 10.7522, tz = 1) ⇒ Object

Notable astronomical events for a date (simple rule-based). Returns array of event description strings.



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# File 'lib/timely/astronomy.rb', line 152

def self.astro_events(date, lat = 59.9139, lon = 10.7522, tz = 1)
  events = []

  # Check for notable moon phase
  phase = moon_phase(date)
  if notable_phase?(date)
    events << "#{phase[:symbol]} #{phase[:phase_name]}"
  end

  # Check for solstices and equinoxes
  m, d = date.month, date.day
  events << "\u2600 Summer Solstice" if m == 6 && d == 21
  events << "\u2744 Winter Solstice" if m == 12 && d == 21
  events << "\u2600 Vernal Equinox" if m == 3 && d == 20
  events << "\u2600 Autumnal Equinox" if m == 9 && d == 22

  # Major meteor showers (peak dates)
  events << "\u2604 Quadrantids peak" if m == 1 && d == 3
  events << "\u2604 Lyrids peak" if m == 4 && d == 22
  events << "\u2604 Eta Aquariids peak" if m == 5 && d == 6
  events << "\u2604 Perseids peak" if m == 8 && d == 12
  events << "\u2604 Orionids peak" if m == 10 && d == 21
  events << "\u2604 Leonids peak" if m == 11 && d == 17
  events << "\u2604 Geminids peak" if m == 12 && d == 14

  events
end

.load_ephemeris ⇒ Object 



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# File 'lib/timely/astronomy.rb', line 93

def self.load_ephemeris
  return if defined?(Ephemeris)
  begin
    require 'ephemeris'
  rescue LoadError
    path = File.expand_path('~/Main/G/GIT-isene/ephemeris/lib/ephemeris.rb')
    require path if File.exist?(path)
  end
end

.moon_phase(date) ⇒ Object

Calculate moon phase for a given Date. Returns a hash with :illumination (0.0-1.0), :phase_name, :symbol, :phase_index



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# File 'lib/timely/astronomy.rb', line 15

def self.moon_phase(date)
  # Julian date calculation
  y = date.year
  m = date.month
  d = date.day

  jd = 367 * y - (7 * (y + ((m + 9) / 12))) / 4 + (275 * m) / 9 + d + 1721013.5

  # Days since known new moon (Jan 6, 2000 18:14 UTC)
  # Reference epoch: JD 2451550.1 (known new moon)
  days_since = jd - 2451550.1
  synodic_month = 29.530588853

  # Normalize to 0.0 - 1.0 within synodic month
  phase = (days_since / synodic_month) % 1.0
  phase = phase + 1.0 if phase < 0

  # Map phase position to illumination (0 = new, 0.5 = full)
  # Illumination follows a cosine curve
  illumination = (1.0 - Math.cos(phase * 2 * Math::PI)) / 2.0

  # Determine phase index (0-7)
  phase_index = (phase * 8).floor % 8

  {
    illumination: illumination.round(4),
    phase: phase.round(4),
    phase_name: PHASE_NAMES[phase_index],
    symbol: PHASE_SYMBOLS[phase_index],
    phase_index: phase_index
  }
end

.moon_symbol(date) ⇒ Object

Return a short symbol for display in calendar cells



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# File 'lib/timely/astronomy.rb', line 49

def self.moon_symbol(date)
  moon_phase(date)[:symbol]
end

.notable_phase?(date) ⇒ Boolean

Check if this is a notable phase (new, first quarter, full, last quarter). Only returns true on the day closest to the exact phase transition.

Returns:

  • (Boolean) 


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# File 'lib/timely/astronomy.rb', line 55

def self.notable_phase?(date)
  today_phase = moon_phase(date)
  index = today_phase[:phase_index]
  return false unless [0, 2, 4, 6].include?(index)

  # Check if yesterday had a different phase index
  yesterday = moon_phase(date - 1)
  yesterday[:phase_index] != index
end

.notable_phases_in_month(year, month) ⇒ Object

Find all notable moon phase dates within a month. Returns array of { date:, phase_name:, symbol: }



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# File 'lib/timely/astronomy.rb', line 67

def self.notable_phases_in_month(year, month)
  last_day = Date.new(year, month, -1).day
  result = []
  (1..last_day).each do |d|
    date = Date.new(year, month, d)
    if notable_phase?(date)
      p = moon_phase(date)
      result << { date: date, day: d, phase_name: p[:phase_name], symbol: p[:symbol] }
    end
  end
  result
end

.sun_times(date, lat = 59.9139, lon = 10.7522, tz = 1) ⇒ Object

Sunrise/sunset for a given date and location. Returns { rise: "HH:MM", set: "HH:MM" }



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# File 'lib/timely/astronomy.rb', line 82

def self.sun_times(date, lat = 59.9139, lon = 10.7522, tz = 1)
  load_ephemeris
  return nil unless defined?(Ephemeris)
  eph = Ephemeris.new(date.strftime('%Y-%m-%d'), lat, lon, tz)
  rise, _, sett = eph.rts(eph.sun[0], eph.sun[1])
  { rise: rise.is_a?(String) ? rise[0..4] : rise.to_s,
    set: sett.is_a?(String) ? sett[0..4] : sett.to_s }
rescue => e
  nil
end

.visible_planets(date, lat = 59.9139, lon = 10.7522, tz = 1) ⇒ Object

Returns array of planet names visible at night for the given date/location. A planet is "visible" if altitude > 5 degrees at any hour between 20:00-04:00.



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# File 'lib/timely/astronomy.rb', line 121

def self.visible_planets(date, lat = 59.9139, lon = 10.7522, tz = 1)
  load_ephemeris
  return [] unless defined?(Ephemeris)

  date_str = date.strftime('%Y-%m-%d')
  eph = Ephemeris.new(date_str, lat, lon, tz)
  visible = []

  %w[mercury venus mars jupiter saturn].each do |planet|
    # Check altitude at evening/night hours
    [20.0, 21.0, 22.0, 23.0, 0.0, 1.0, 2.0, 3.0, 4.0].any? do |h|
      alt, _ = eph.body_alt_az(planet, h)
      if alt > 5
        body = eph.send(planet)
        visible << {
          name: planet.capitalize,
          symbol: PLANET_SYMBOLS[planet],
          rise: body[5].is_a?(String) ? body[5][0..4] : body[5].to_s,
          set: body[7].is_a?(String) ? body[7][0..4] : body[7].to_s
        }
        true
      end
    end
  end
  visible
rescue => e
  []
end