Class: Astronoby::Events::MoonPhases

Inherits:
Object
  • Object
show all
Defined in:
lib/astronoby/events/moon_phases.rb

Constant Summary collapse

BASE_YEAR = 
2000

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(year, month, phase, phase_increment) ⇒ MoonPhases

Returns a new instance of MoonPhases.

Parameters:

  • year (Integer) —

    Requested year

  • month (Integer) —

    Requested month

  • phase (Symbol) —

    Moon phase

  • phase_increment (Float) —

    Phase increment



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# File 'lib/astronoby/events/moon_phases.rb', line 34

def initialize(year, month, phase, phase_increment)
  @year = year
  @month = month
  @phase = phase
  @phase_increment = phase_increment
end

Class Method Details

.phases_for(year:, month:) ⇒ Array<Astronoby::MoonPhase>

Returns List of Moon phases.

Parameters:

  • year (Integer) —

    Requested year

  • month (Integer) —

    Requested month

Returns:



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# File 'lib/astronoby/events/moon_phases.rb', line 17

def self.phases_for(year:, month:)
  [
    MoonPhase.first_quarter(new(year, month, :first_quarter, -0.75).time),
    MoonPhase.full_moon(new(year, month, :full_moon, -0.5).time),
    MoonPhase.last_quarter(new(year, month, :last_quarter, -0.25).time),
    MoonPhase.new_moon(new(year, month, :new_moon, 0).time),
    MoonPhase.first_quarter(new(year, month, :first_quarter, 0.25).time),
    MoonPhase.full_moon(new(year, month, :full_moon, 0.5).time),
    MoonPhase.last_quarter(new(year, month, :last_quarter, 0.75).time),
    MoonPhase.new_moon(new(year, month, :new_moon, 1).time)
  ].select { _1.time.month == month }
end

Instance Method Details

#time ⇒ Time

Returns Time of the Moon phase.

Returns:

  • (Time) —

    Time of the Moon phase



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# File 'lib/astronoby/events/moon_phases.rb', line 42

def time
  correction = moon_phases_periodic_terms
    .public_send(:"#{@phase}_correction")
  terrestrial_time = Epoch.to_utc(
    julian_ephemeris_day +
      correction +
      moon_phases_periodic_terms.additional_corrections
  )
  delta = Util::Time.terrestrial_universal_time_delta(terrestrial_time)
  (terrestrial_time - delta).round
end