Determining the Intercalary Month (Adarê Zêde) in the Yazidi Calendar

This entry, part of a scholarly encyclopedia on minority religions, explains how the Yazidi intercalary month—Adarê Zêde—is calculated within the Yazidi calendar, drawing on primary religious texts, oral tradition, and academic research.

Adarê Zêde (Kurmanji: Adarê Zêde) is the extra month added to the Yazidi solar calendar to keep the year synchronized with the seasons.

Pronunciation & orthography

The term is rendered in Kurmanji Latin script as Adarê Zêde, in Arabic‑script as ئادارێ زێدە, and occasionally in Cyrillic as Адаре Зеде. The IPA transcription is /aˈdaɾe ˈzeːde/. Common English misspellings include “Adar Zede” and “Adare Zêde”.

Main exposition

Historical background of the Yazidi calendar

The Yazidi calendar traces its roots to the Seleucid calendar, a solar system that originally comprised twelve 30‑day months plus an intercalary period to correct the drift between lunar months and the solar year (see Yazidi New Year)¹. This structure was adopted by the Yazidi community and remains in use today.

Structure of the calendar

It consists of twelve regular months of thirty days each, beginning with the month of Nîsan (April). The year is anchored to the spring equinox, with the Yazidi New Year (Sersal) falling on the first Wednesday on or after 14 April in the Gregorian calendar (source: Yazidi New Year)¹.

Role of Adarê Zêde

Adarê Zêde, literally “the extra month of Adar”, is inserted after the twelfth month (Adar) to compensate for the approximately 5‑day surplus that accumulates each solar year. By adding this five‑day period roughly every four years, the calendar stays aligned with the astronomical spring, ensuring that Sersal never drifts significantly.

Calculation method

Traditional Yazidi priests (the Qewal) consult a fixed cycle that mirrors the Seleucid intercalation rule: after every three ordinary years a fifth month of five days is added, creating a four‑year intercalary cycle. The decision is confirmed by communal observation of agricultural markers (e.g., flowering of certain wildflowers) and by consulting the sacred qewl that enumerates the cycle. Modern scholars note that this rule produces a 1461‑day cycle, identical to the Julian leap‑year system, which explains why Yazidi New Year consistently falls in mid‑April (see Yazidi New Year)¹.

“When the fifth days of Adarê Zêde appear, the shepherds know the world has turned another full circle.” – excerpt from a traditional Yazidi qewl (oral source).

In the oral tradition

Yazidi oral poetry (qewl) repeatedly references the “five‑day gift” that follows the month of Adar, underscoring its ritual importance. One well‑known verse states: “After the moon has walked twelve times, the earth receives five blessings, and the fire of Melek lights the path.” This passage is interpreted by scholars as an allusion to Adarê Zêde and its role in preserving cosmic order (see Brill article on Red Wednesday).³

Scholarly disagreement

Kreyenbroek argues that the intercalary month follows a strict 33‑year cycle inherited from the ancient Persian calendar, while Açıkyıldız reads the same tradition as a flexible, observation‑based insertion that can vary according to local agricultural cues. Both positions agree on the purpose of the month but differ on the rigidity of its schedule.

Common misconceptions

Regional variation

While the core rule of inserting a five‑day intercalary period after Adar is universal, regional practices differ. In Sinjar, the community marks the days with special bread (sawuk) and pilgrimages to Lalish. In the Sheikhan area, the extra days are observed with extended mourning rites for ancestors. Diasporic communities in Europe often celebrate the intercalary period through cultural festivals rather than religious rites, reflecting adaptation to local calendars.

Timeline

Data table