This chart shows the fluctuations of the eighth new moon after Naw-Rúz (Bahá'í New Year) 172 to 221 B.E. (2015 - 2065 C.E.), marking the date for the Twin Holy Birthdays, referring to two successive holy days in the Bahá'í calendar and effective from 2015 C.E. onwards. The dates for this chart have been taken from the following table: Bahá'í Dates 172 to 221 B.E. (2015 - 2065; prepared by the Baha'i World Centre).