The curious fact has long been known that the greatest single festival of the Zoroastrian year, Nō Rōz, is celebrated twice over, with almost identical observances, on two separate days, namely Rōz Ohrmazd of Māh Fravardīn, and Rōz Hordād of the same month, i.e. on the first and sixth days of the first month of the year. As al-Bīrῡnī recorded, writing c. A.D. 1000: ‘On the sixth of Fravardīn, the day Hordād, is the Great Nō Rōz, for the Persians a feast of great importance’. The first of this month was celebrated as the Lesser Nō Rōz. Sasanian melodies were named for both Nō Rōz ī wuzorg and Nō Rōz ī xwurdag; and later the two days were also known respectively as the ‘special’ Nō Rōz (Nō Rōz-i xāṣṣa) and the 'general’ Nō Rōz (Nō Rōz-i ‘āmma). Among the Parsis the Great Nō Rōz ‘is kept with as much pomp and rejoicing as…New Year's Day’; and in Persia orthodox priests still do not recite Rapithwin Gāh, the daily prayer which marks Nō Rōz and the return of summer, until noon on Rōz Hordād of Māh Fravardīn, on which day the faithful there gather together for communal services to celebrate the beginning of the new religious year.