verdi’s A – 432 Mhz – Google Search

Scientific pitch, also known as philosophical pitch, Sauveur pitch or Verdi tuning, is an absolute … With a Verdi pitch standard of A4 = 432 Hz = 24 × 33, in just tuning all octaves (factor 2), perfect fourths (factor 4:3) and fifths (factor 3:2) will have

Source: verdi’s A – 432 Mhz – Google Search