 A quite different chronology is proposed for astronomical cycles by de Callataÿ based on Epistle 36 On cycles and revolutions. He distinguishes three “medium conjunctions” of Saturn and Jupiter occurring every 240 years and a longer conjunction occurring approximately every 960 years. The year 571 (birth of the Prophet Muhammad) marks a “longest conjunction” (from Libra to Scorpio); the first “medium conjunction” in 809 is of no importance to the Ikhwân; the second (from Sagittarius to Capricorn) should take place in 1047, and would be the “imminent conjunction” described in Epistle 48; the third (from Capricorn to Aquarius) is awaited in 1286; and the “longest conjunction” (from Aquarius to Libra) will take place in 1524 and will correspond to the rising of the qâ’im of the Resurrection (de Callataÿ 2005, 55–57; Walker et al. 2015, 150–152, 156, 204–206).