The Kitáb-i-Aqdas - The Most Holy Book
Index term: Leap Year
n27.
Let the days in excess of the months be placed before the month of fasting.
The Badí' calendar is based on the solar year of 365 days, 5 hours, and 50 odd minutes. The year consists of 19 months of 19 days each (i.e. 361 days), with the addition of four extra days (five in a leap year). The Báb did not specifically define the place for the intercalary days in the new calendar. The Kitáb-i-Aqdas resolves this question by assigning the "excess" days a fixed position in the calendar immediately preceding the month of 'Alá', the period of fasting. For further details see the section on the Bahá'í calendar in The Bahá'í World, volume XVIII.
n147.
The number of months in a year, appointed in the Book of God, is nineteen.
The Bahá'í year, in accordance with the Badí' calendar, consists of nineteen months of nineteen days each, with the addition of certain intercalary days (four in an ordinary year and five in a leap year) between the eighteenth and nineteenth months in order to adjust the calendar to the solar year. The Báb named the months after certain attributes of God. The Bahá'í New Year, Naw-Rúz, is astronomically fixed, coinciding with the March equinox (see note 26). For further details, including the names of the days of the week and the months, see the section on the Bahá'í calendar in The Bahá'í World, volume XVIII.