Class: RubyChartEngine::Calculations::Positions

Inherits:
Object
  • Object
show all
Defined in:
lib/ruby_chart_engine/calculations/positions.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(julian_day:, latitude:, longitude:) ⇒ Positions

Returns a new instance of Positions.



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# File 'lib/ruby_chart_engine/calculations/positions.rb', line 6

def initialize(julian_day:, latitude:, longitude:)
  @julian_day = julian_day
  @latitude = latitude
  @longitude = longitude
end

Instance Attribute Details

#julian_day ⇒ Object (readonly)

Returns the value of attribute julian_day.



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# File 'lib/ruby_chart_engine/calculations/positions.rb', line 4

def julian_day
  @julian_day
end

#latitude ⇒ Object (readonly)

Returns the value of attribute latitude.



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# File 'lib/ruby_chart_engine/calculations/positions.rb', line 4

def latitude
  @latitude
end

#longitude ⇒ Object (readonly)

Returns the value of attribute longitude.



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# File 'lib/ruby_chart_engine/calculations/positions.rb', line 4

def longitude
  @longitude
end

Instance Method Details

#calculate_all_planets ⇒ Object

Calculate all planets



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# File 'lib/ruby_chart_engine/calculations/positions.rb', line 49

def calculate_all_planets
  positions = {}

  PLANETS.each do |name, id|
    positions[name] = calculate_planet(id)
  end

  # Calculate points
  POINTS.each do |name, id|
    if name == :south_node
      # South Node is opposite of North Node
      north_node = calculate_planet(POINTS[:north_node])
      positions[name] = north_node.dup
      positions[name][:longitude] = normalize_degrees(north_node[:longitude] + 180)
    elsif name == :chiron
      # Chiron is not available in Moshier ephemeris, skip it
      # Would require external ephemeris files (seas_*.se1)
      next
    else
      positions[name] = calculate_planet(id)
    end
  end

  positions
end

#calculate_planet(planet_id) ⇒ Object

Calculate position for a single celestial object



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# File 'lib/ruby_chart_engine/calculations/positions.rb', line 13

def calculate_planet(planet_id)
  # Calculation flags: 4 = SEFLG_MOSEPH (use built-in Moshier ephemeris), 256 = SEFLG_SPEED
  # Using Moshier ephemeris (analytical) to avoid needing external ephemeris files
  # Provides precision of ~0.1 arc seconds for planets, ~3" for Moon
  flags = 4 | 256  # SEFLG_MOSEPH | SEFLG_SPEED

  result = Swe4r.swe_calc_ut(julian_day, planet_id, flags)

  # swe_calc_ut returns an array: [longitude, latitude, distance, speed_long, speed_lat, speed_dist]
  # Extract values based on whether it's an array or hash
  if result.is_a?(Array)
    {
      longitude: result[0],
      latitude: result[1],
      distance: result[2],
      speed_longitude: result[3],
      speed_latitude: result[4],
      speed_distance: result[5]
    }
  elsif result.is_a?(Hash)
    {
      longitude: result[:longitude] || result['longitude'],
      latitude: result[:latitude] || result['latitude'],
      distance: result[:distance] || result['distance'],
      speed_longitude: result[:speed_longitude] || result['speed_longitude'],
      speed_latitude: result[:speed_latitude] || result['speed_latitude'],
      speed_distance: result[:speed_distance] || result['speed_distance']
    }
  else
    raise Error, "Unexpected swe_calc_ut return type: #{result.class}"
  end
rescue => e
  raise Error, "Failed to calculate position for planet #{planet_id}: #{e.message}"
end

#longitude_to_sign(longitude) ⇒ Object

Get sign from longitude



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# File 'lib/ruby_chart_engine/calculations/positions.rb', line 76

def longitude_to_sign(longitude)
  sign_index = (longitude / 30).floor
  sign_longitude = longitude % 30

  {
    index: sign_index,
    sign: SIGNS[sign_index],
    longitude: sign_longitude,
    decan: ((sign_longitude / 10).floor + 1)
  }
end

#movement_status(speed) ⇒ Object

Get movement status



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# File 'lib/ruby_chart_engine/calculations/positions.rb', line 94

def movement_status(speed)
  if speed.abs < 0.0001
    'stationary'
  elsif speed < 0
    'retrograde'
  else
    'direct'
  end
end

#retrograde?(speed) ⇒ Boolean

Determine if planet is retrograde

Returns:

  • (Boolean) 


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# File 'lib/ruby_chart_engine/calculations/positions.rb', line 89

def retrograde?(speed)
  speed < 0
end