code: final boolean hasNoMajorSolarTerm(long utcDays) {
          double jd0 = JulianDay.ofEphemerisTime(this.midnight(utcDays)).getValue();
          int index0 = (2 + (int) Math.floor(SolarTerm.solarLongitude(jd0) / 30)) % 12;
          double jd1 = JulianDay.ofEphemerisTime(this.midnight(this.newMoonOnOrAfter(utcDays + 1))).getValue();
          int index1 = (2 + (int) Math.floor(SolarTerm.solarLongitude(jd1) / 30)) % 12;
          return (index0 == index1);
      }
docs: leap months have no major solar terms