Class: When::Ephemeris::Datum

Inherits:
CelestialObject show all
Defined in:
lib/when_exe/ephemeris.rb,
lib/when_exe/region/planets.rb

Overview

座標の基準になる天体

座標の基準になる天体の特性を定義する

Direct Known Subclasses

Big, Far, Near, Earth, Moon, Sun

Defined Under Namespace

Classes: Big, Far, Near

Constant Summary

Constants included from When::Ephemeris

AU, AcS, BCENT, C0, CIRCLE, COS, COSL, COSLT, COST, DAY, DEG, EPOCH1800, EPOCH1900, EPOCH1975, EPOCH2000, FARAWAY, JCENT, JYEAR, Jupiter, LIN, Mars, Mercury, Neptune, P0B, P0L, P0P, P0dB, P0dL, P1B, P1L, P1R, P2B, P2L, P2Q, P2dL, P3L, P3Q, P4B, P4L, P4Q, P4dL, P5B, P5L, P5Q, P5dL, P5l, P5n, P5r, P5t, P6B, P6L, P6Q, P6dL, P6l, P6n, P6r, P6t, P7B, P7L, P7R, P8B, P8L, P8R, P9B, P9L, P9R, PSEC, Pluto, SIN, SINL, SINLT, SINT, Saturn, Uranus, Venus

Constants included from Parts::Resource

Parts::Resource::LabelProperty, Parts::Resource::Prefix, Parts::Resource::PrefixIndex, Parts::Resource::PrefixKeys, Parts::Resource::PrefixValues

Instance Attribute Summary collapse

Attributes inherited from CelestialObject

#aberration, #luminosity

Attributes inherited from BasicTypes::Object

#label

Attributes included from Parts::Resource

#_pool, #child, #keys, #locale, #namespace

Instance Method Summary collapse

Methods inherited from CelestialObject

#coords

Methods included from When::Ephemeris

_rot, _to_p2, _to_p3, _to_r3, acos, asin, cosc, cosd, delta_e, delta_p, julian_century_from_2000, julian_year_from_1975, obl, polynomial, root, sinc, sind, tanc, tand, trigonometric

Methods inherited from BasicTypes::Object

#tap

Methods included from Parts::Resource

#[], #^, _extract_prefix, _instance, _parse, _path_with_prefix, #each, #enum_for, #hierarchy, #include?, #included?, #iri, #leaf?, #m17n, #map, #next, #parent, #prev, #registered?

Methods included from Parts::Resource::Pool

#[], #[]=, #_pool, #_setup_, #pool_keys

Methods included from Parts::Resource::Synchronize

#synchronize

Dynamic Method Handling

This class handles dynamic methods through the method_missing method in the class When::Parts::Resource

Instance Attribute Details

#air ⇒ Array<Numeric> (readonly)

大気の補正

Returns:



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# File 'lib/when_exe/ephemeris.rb', line 954

def air
  @air
end

#axis ⇒ Array<Numeric> (readonly)

自転軸

Returns:



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# File 'lib/when_exe/ephemeris.rb', line 958

def axis
  @axis
end

#dl ⇒ Array<Numeric> (readonly)

黄経の補正の係数

Returns:



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# File 'lib/when_exe/ephemeris.rb', line 910

def dl
  @dl
end

#first_day ⇒ Numeric (readonly)

計算式の精度保証期間の下限 / ユリウス日

Returns:



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# File 'lib/when_exe/ephemeris.rb', line 898

def first_day
  @first_day
end

#jsl ⇒ Array<Numeric> (readonly)

黄経の係数2 (木星-土星)

Returns:



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# File 'lib/when_exe/ephemeris.rb', line 930

def jsl
  @jsl
end

#jsn ⇒ Array<Numeric> (readonly)

黄経の係数1 (木星-土星)

Returns:



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# File 'lib/when_exe/ephemeris.rb', line 926

def jsn
  @jsn
end

#jsr ⇒ Array<Numeric> (readonly)

動径の係数 (木星-土星)

Returns:



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# File 'lib/when_exe/ephemeris.rb', line 938

def jsr
  @jsr
end

#jst ⇒ Array<Numeric> (readonly)

黄緯の係数 (木星-土星)

Returns:



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# File 'lib/when_exe/ephemeris.rb', line 934

def jst
  @jst
end

#last_day ⇒ Numeric (readonly)

計算式の精度保証期間の上限 / ユリウス日

Returns:



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# File 'lib/when_exe/ephemeris.rb', line 902

def last_day
  @last_day
end

#nn ⇒ Array<Numeric> (readonly)

木星と土星の相互摂動項

Returns:



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# File 'lib/when_exe/ephemeris.rb', line 922

def nn
  @nn
end

#phi ⇒ Array<Numeric> (readonly)

黄経の係数

Returns:



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# File 'lib/when_exe/ephemeris.rb', line 906

def phi
  @phi
end

#radius ⇒ Array<Numeric> (readonly)

動径の係数

Returns:



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# File 'lib/when_exe/ephemeris.rb', line 918

def radius
  @radius
end

#shape ⇒ Array<Numeric> (readonly)

惑星の形

Returns:



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# File 'lib/when_exe/ephemeris.rb', line 942

def shape
  @shape
end

#sid ⇒ Array<Numeric> (readonly)

自転 - 平均太陽の赤経(2000年分点)

Returns:



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# File 'lib/when_exe/ephemeris.rb', line 946

def sid
  @sid
end

#surface_radius ⇒ Numeric (readonly)

半径/km

Returns:



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# File 'lib/when_exe/ephemeris.rb', line 894

def surface_radius
  @surface_radius
end

#theta ⇒ Array<Numeric> (readonly)

黄緯の係数

Returns:



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# File 'lib/when_exe/ephemeris.rb', line 914

def theta
  @theta
end

#zeros ⇒ Hash<String=>Numeric> (readonly)

天体の出没、薄明の閾値

Returns:



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# File 'lib/when_exe/ephemeris.rb', line 950

def zeros
  @zeros
end

Instance Method Details

#apparent_luminosity(t, base) ⇒ Numeric

視光度 / magnitude

Parameters:

Returns:



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# File 'lib/when_exe/ephemeris.rb', line 1051

def apparent_luminosity(t, base)
  return @luminosity - 2.5*log10(base._coords(t).luminosity_spe(self._coords(t)))
end

#apparent_radius(t, base = Earth) ⇒ Numeric

視半径 / CIRCLE

Parameters:

Returns:



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# File 'lib/when_exe/ephemeris.rb', line 1038

def apparent_radius(t, base=Earth)
  target_coords = self.coords(t, base)
  asin(@surface_radius / (target_coords.radius * AU)) / CIRCLE
end

#axis_of_rotation(t) ⇒ When::Ephemeris::Coords

自転軸の歳差補正

Parameters:

Returns:



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# File 'lib/when_exe/ephemeris.rb', line 1003

def axis_of_rotation(t)
  return nil unless @axis
  c1900 = (@axis[0]-1900.0)/100.0
  dt    = (+t-(EPOCH1900-0.68648354))/BCENT - c1900
  Coords.polar(
    (@axis[1][0] + dt * @axis[2][0]) / 360,
    (@axis[1][1] + dt * @axis[2][1]) / 360,
    (@axis[1][2] + dt * @axis[2][2]) / 360
  ).precession(dt, c1900)
end

#eclipse(t, target, base = Earth) ⇒ Numeric

食分

Parameters:

Returns:



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# File 'lib/when_exe/ephemeris.rb', line 1082

def eclipse(t, target, base=Earth)
  t = +t
  distance      = self.coords(t, base).spherical_law_of_cosines(target.coords(t, base)) / CIRCLE
  self_radius   = self.apparent_radius(t, base)
  target_radius = target.apparent_radius(t, base)
  return (self_radius + target_radius - distance) / (2.0 * target_radius)
end

#elongation(t, target = Sun, base = Earth) ⇒ Numeric

離角 / CIRCLE

Parameters:

Returns:



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# File 'lib/when_exe/ephemeris.rb', line 1064

def elongation(t, target=Sun, base=Earth)
  t = +t
  self_coords   = self.coords(t, base)
  target_coords = target.coords(t, base)
  elongation    = acos(self_coords.spherical_law_of_cosines(target_coords)) / CIRCLE
  difference    = (self_coords.phi - target_coords.phi + 0.5) % 1 - 0.5
  return (difference >= 0) ? elongation : -elongation
end

#equation_of_time(t) ⇒ Numeric

均時差 / DAY

Parameters:

Returns:



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# File 'lib/when_exe/ephemeris.rb', line 1021

def equation_of_time(t)
  t = +t
  c = julian_century_from_2000(t)
  coords = _coords(t)
  coords = coords.rotate_z(0.5 - (@aberration||0) / coords.radius / 360)
  coords = coords.y_to_r(t, self)
  return 0.5 - ((coords.phi - (@sid[0] + c * (@sid[1] + c * @sid[2])) / 24.0) % 1)
end

#mean_longitude(t) ⇒ Numeric

光行差を含んだ平均黄経 / CIRCLE

Parameters:

Returns:



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# File 'lib/when_exe/ephemeris.rb', line 977

def mean_longitude(t)
  coord = _coords(t)
  coord.c - @aberration / coord.radius / 360
end

#mean_motion ⇒ Numeric

平均運動 / (DEG / YEAR)

Returns:



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# File 'lib/when_exe/ephemeris.rb', line 965

def mean_motion
  return @phi[0][2]
end

#true_longitude(t) ⇒ Numeric

光行差を含んだ真黄経 / CIRCLE

Parameters:

Returns:



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# File 'lib/when_exe/ephemeris.rb', line 990

def true_longitude(t)
  coord = _coords(t)
  coord.phi - @aberration / coord.radius / 360
end