The Kitáb-i-Aqdas
King of Festivals” and, second, the Báb’s Declaration, which occurred in May 1844 in Shíráz. The first, ninth and twelfth days of the Festival of Riḍván are Holy Days (Q and A 1), as is the day of the Declaration of the Báb.
The “two other Festivals” are the anniversaries of the births of Bahá’u’lláh and the Báb. In the Muslim lunar calendar these fall on consecutive days, the birth of Bahá’u’lláh on the second day of the month of Muharram 1233 A.H. (12 November 1817), and the birth of the Báb on the first day of the same month 1235 A.H. (20 October 1819), respectively. They are thus referred to as the “Twin Birthdays” and Bahá’u’lláh states that these two days are accounted as one in the sight of God (Q and A 2). He states that, should they fall within the month of fasting, the command to fast shall not apply on those days (Q and A 36). Given that the Bahá’í calendar (see notes 26 and 147) is a solar calendar, it remains for the Universal House of Justice to determine whether the Twin Holy Birthdays are to be celebrated on a solar or lunar basis.1
139.the first day of the month of Bahá ¶111
In the Bahá’í calendar the first month of the year and the first day of each month are given the name “Bahá”. The day of Bahá of the month of Bahá is thus the Bahá’í New Year, Naw-Rúz, which was ordained by the Báb as a festival and is here confirmed by Bahá’u’lláh (see notes 26 and 147).
In addition to the seven Holy Days ordained in these passages of the Kitáb-i-Aqdas, the anniversary of the Martyrdom of the Báb was also commemorated as a Holy Day in the lifetime of Bahá’u’lláh and, as a corollary to this, ‘Abdu’l-Bahá added the observance of the Ascension of Bahá’u’lláh, making nine Holy Days in all. Two other anniversaries which are observed, but on which work is not suspended, are the Day of the Covenant and the anniversary of the Passing of ‘Abdu’l-Bahá. See the section on the Bahá’í calendar in The Bahá’í World, volume XVIII.
1 Ed: See the letter from the Universal House of Justice dated 10 July 2014 regards the timing of the Twin Birthdays, and other important updates, effective beginning 172 B.E. (Gregorian from sunset 20 March 2015).