Class: Astronoby::MoonPhasesPeriodicTerms

Inherits:
Object
  • Object
show all
Defined in:
lib/astronoby/astronomical_models/moon_phases_periodic_terms.rb

Instance Method Summary collapse

Constructor Details

#initialize(julian_centuries:, time:, eccentricity_correction:, moon_mean_anomaly:, sun_mean_anomaly:, moon_argument_of_latitude:, longitude_of_the_ascending_node:) ⇒ MoonPhasesPeriodicTerms

Returns a new instance of MoonPhasesPeriodicTerms.

Parameters:

  • julian_centuries (Float) —

    Julian centuries

  • time (Float) —

    Time

  • eccentricity_correction (Float) —

    Eccentricity correction

  • moon_mean_anomaly (Float) —

    Moon mean anomaly

  • sun_mean_anomaly (Float) —

    Sun mean anomaly

  • moon_argument_of_latitude (Float) —

    Moon argument of latitude

  • longitude_of_the_ascending_node (Float) —

    Longitude of the ascending node



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# File 'lib/astronoby/astronomical_models/moon_phases_periodic_terms.rb', line 20

def initialize(
  julian_centuries:,
  time:,
  eccentricity_correction:,
  moon_mean_anomaly:,
  sun_mean_anomaly:,
  moon_argument_of_latitude:,
  longitude_of_the_ascending_node:

)
  @julian_centuries = julian_centuries
  @time = time
  @eccentricity_correction = eccentricity_correction
  @moon_mean_anomaly = moon_mean_anomaly
  @sun_mean_anomaly = sun_mean_anomaly
  @moon_argument_of_latitude = moon_argument_of_latitude
  @longitude_of_the_ascending_node = longitude_of_the_ascending_node
end

Instance Method Details

#additional_corrections ⇒ Float

Returns Additional corrections.

Returns:

  • (Float) —

    Additional corrections



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# File 'lib/astronoby/astronomical_models/moon_phases_periodic_terms.rb', line 122

def additional_corrections
  [
    [0.000325, a1],
    [0.000165, a2],
    [0.000164, a3],
    [0.000126, a4],
    [0.000110, a5],
    [0.000062, a6],
    [0.000060, a7],
    [0.000056, a8],
    [0.000047, a9],
    [0.000042, a10],
    [0.000040, a11],
    [0.000037, a12],
    [0.000035, a13],
    [0.000023, a14]
  ].map { _1.first * _1.last.sin }.sum
end

#first_quarter_correction ⇒ Float

Returns First quarter correction.

Returns:

  • (Float) —

    First quarter correction



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# File 'lib/astronoby/astronomical_models/moon_phases_periodic_terms.rb', line 76

def first_quarter_correction
  first_and_last_quarter_correction + first_and_last_quarter_final_correction
end

#full_moon_correction ⇒ Float

Returns Full moon correction.

Returns:

  • (Float) —

    Full moon correction



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# File 'lib/astronoby/astronomical_models/moon_phases_periodic_terms.rb', line 81

def full_moon_correction
  ecc = @eccentricity_correction
  mma = @moon_mean_anomaly.radians
  sma = @sun_mean_anomaly.radians
  maol = @moon_argument_of_latitude.radians
  lotan = @longitude_of_the_ascending_node.radians
  [
    [-0.40614, mma],
    [0.17302 * ecc, sma],
    [0.01614, 2 * mma],
    [0.01043, 2 * maol],
    [0.00734 * ecc, mma - sma],
    [-0.00515 * ecc, mma + sma],
    [0.00209 * ecc * ecc, 2 * sma],
    [-0.00111, mma - 2 * maol],
    [-0.00057, mma + 2 * maol],
    [0.00056 * ecc, 2 * mma + sma],
    [-0.00042, 3 * mma],
    [0.00042 * ecc, sma + 2 * maol],
    [0.00038 * ecc, sma - 2 * maol],
    [-0.00024 * ecc, 2 * mma - sma],
    [-0.00017, lotan],
    [-0.00007, mma + 2 * sma],
    [0.00004, 2 * mma - 2 * maol],
    [0.00004, 3 * sma],
    [0.00003, mma + sma - 2 * maol],
    [0.00003, 2 * mma + 2 * maol],
    [-0.00003, mma + sma + 2 * maol],
    [0.00003, mma - sma + 2 * maol],
    [-0.00002, mma - sma - 2 * maol],
    [-0.00002, 3 * mma + sma],
    [0.00002, 4 * mma]
  ].map { _1.first * Math.sin(_1.last) }.sum
end

#last_quarter_correction ⇒ Float

Returns Last quarter correction.

Returns:

  • (Float) —

    Last quarter correction



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# File 'lib/astronoby/astronomical_models/moon_phases_periodic_terms.rb', line 117

def last_quarter_correction
  first_and_last_quarter_correction - first_and_last_quarter_final_correction
end

#new_moon_correction ⇒ Float

Returns New moon correction.

Returns:

  • (Float) —

    New moon correction



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# File 'lib/astronoby/astronomical_models/moon_phases_periodic_terms.rb', line 40

def new_moon_correction
  ecc = @eccentricity_correction
  mma = @moon_mean_anomaly.radians
  sma = @sun_mean_anomaly.radians
  maol = @moon_argument_of_latitude.radians
  lotan = @longitude_of_the_ascending_node.radians
  [
    [-0.40720, mma],
    [0.17241 * ecc, sma],
    [0.01608, 2 * mma],
    [0.01039, 2 * maol],
    [0.00739 * ecc, mma - sma],
    [-0.00514 * ecc, mma + sma],
    [0.00208 * ecc * ecc, 2 * sma],
    [-0.00111, mma - 2 * maol],
    [-0.00057, mma + 2 * maol],
    [0.00056 * ecc, 2 * mma + sma],
    [-0.00042, 3 * mma],
    [0.00042 * ecc, sma + 2 * maol],
    [0.00038 * ecc, sma - 2 * maol],
    [-0.00024 * ecc, 2 * mma - sma],
    [-0.00017, lotan],
    [-0.00007, mma + 2 * sma],
    [0.00004, 2 * mma - 2 * maol],
    [0.00004, 3 * sma],
    [0.00003, mma + sma - 2 * maol],
    [0.00003, 2 * mma + 2 * maol],
    [-0.00003, mma + sma + 2 * maol],
    [0.00003, mma - sma + 2 * maol],
    [-0.00002, mma - sma - 2 * maol],
    [-0.00002, 3 * mma + sma],
    [0.00002, 4 * mma]
  ].map { _1.first * Math.sin(_1.last) }.sum
end