Method: When::Ephemeris::Sun.mean_longitude

Defined in:: lib/when_exe/ephemeris/sun.rb

.mean_longitude(t) ⇒ `Numeric`

平均黄経 / CIRCLE

Parameters:

t (Numeric) —

ユリウス日(Terrestrial Time)
t (When::TM::TemporalPosition)

Returns:

(Numeric)



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# File 'lib/when_exe/ephemeris/sun.rb', line 97

def mean_longitude(t)
  return trigonometric(julian_year_from_1975(+t), P3L, 0.0, 1) / 360.0 + 1974.0
end