Method: When::Ephemeris::Datum#phase_of_eclipse

Defined in:

lib/when_exe/ephemeris.rb

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

食分

Parameters:

• t (Numeric) —

  ユリウス日(Terrestrial Time)

• t (When::TM::TemporalPosition)
• target (When::Ephemeris::Datum) —

  基準星

• base (When::Coordinates::Spatial, When::Ephemeris::Datum) (defaults to: Earth) —

  観測地

Returns:

• (Numeric)

# File 'lib/when_exe/ephemeris.rb', line 1122

def phase_of_eclipse(t, target, base=Earth)
  t = +t
  distance      = acos(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