Module: AstroChart::Aspects

Defined in:
lib/astro_chart/aspects.rb

Constant Summary collapse

MAJOR =

Major aspects: angle => [name, max_orb]

{
  60  => ["六分相", 6],   # Sextile
  90  => ["四分相", 8],   # Square
  120 => ["三分相", 8],   # Trine
  180 => ["對分相", 10],  # Opposition
}.freeze
CONJUNCTION_ORB = 
15

Class Method Summary collapse

Class Method Details

.calculate(pos1, pos2) ⇒ Object

Calculate the aspect between two ecliptic positions. Returns [aspect_name, orb] or [nil, nil].



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# File 'lib/astro_chart/aspects.rb', line 15

def self.calculate(pos1, pos2)
  return [nil, nil] if pos1.nil? || pos2.nil?

  p1 = pos1 % 360.0
  p2 = pos2 % 360.0

  diff = (p1 - p2).abs % 360.0
  diff = 360.0 - diff if diff > 180.0

  # Conjunction (widest orb)
  if diff <= CONJUNCTION_ORB
    return ["合相", diff.round(2)]
  end

  # Check major aspects
  MAJOR.each do |angle, (name, max_orb)|
    orb = (diff - angle).abs
    if orb <= max_orb
      return [name, orb.round(2)]
    end
  end

  [nil, nil]
end