def compute_d_mhb2000(jc)
      return ((   1072260.70369   + \
              (1602961601.2090    + \
              (        -6.3706    + \
              (         0.006593  + \
              (        -0.00003169) \
              * jc) * jc) * jc) * jc) % Const::TURNAS) * Const::AS2R
    rescue => e
      raise
    end
def compute_d_mhb2000(jc)
      return ((   1072260.70369   + \
              (1602961601.2090    + \
              (        -6.3706    + \
              (         0.006593  + \
              (        -0.00003169) \
              * jc) * jc) * jc) * jc) % Const::TURNAS) * Const::AS2R
    rescue => e
      raise
    end
=========================================================================
 Mean elongation of the Moon from the Sun (MHB2000)

 @param:  jc         (ユリウス世紀)
 @return: longitude  (rad)
=========================================================================