def fk4_e_terms(equinox):
 k = 0.0056932
 k = np.radians(k)
 e = earth.eccentricity(equinox.jd)
 g = earth.mean_lon_of_perigee(equinox.jd)
 g = np.radians(g)
 o = earth.obliquity(equinox.jd, algorithm=1980)
 o = np.radians(o)
 return (((e * k) * np.sin(g)), ((((- e) * k) * np.cos(g)) * np.cos(o)), ((((- e) * k) * np.cos(g)) * np.sin(o)))

def fk4_e_terms ( equinox ) : k = 0.0056932 k = np . radians ( k ) e = earth . eccentricity ( equinox . jd ) g = earth . mean_lon_of_perigee ( equinox . jd ) g = np . radians ( g ) o = earth . obliquity ( equinox . jd , algorithm = 1980 ) o = np . radians ( o ) return ( ( ( e * k ) * np . sin ( g ) ) , ( ( ( ( - e ) * k ) * np . cos ( g ) ) * np . cos ( o ) ) , ( ( ( ( - e ) * k ) * np . cos ( g ) ) * np . sin ( o ) ) )
return the e-terms of aberation vector parameters equinox : time object the equinox for which to compute the e-terms .