Qumran calendrical texts refers to some of the Dead Sea Scrolls from Qumran that contain references to calendars and timekeeping. These texts include the mishmarot, which were the rosters of weekly shifts or courses for Temple service. In addition to the mishmarot, there are also other calendrical texts, for example those concerned with the yearly festivals, such as found in the Temple Scroll, and the liturgical texts with calendrical structures. Among Qumran texts, there are documents from different periods of time. While most of the texts are in Hebrew, there are also Aramaic documents. Thus several different calendars are attested in Qumran. The most common calendar found is what has often been described in initial publications as a solar calendar. Yet further research showed that the picture is more complicated, and the lunar phases also play an important role in several Qumran documents. About twenty texts from Qumran deal with calendars, which reflects the great importance that the "proper chronology" played for the community that produced the scrolls.
Qumran 364-day calendar The main 364-day calendar found in Qumran has often been described as a ‘solar calendar’. However, several scholars like Philip Callaway and Uwe Glessmer have objected to this terminology, and instead stressed the schematic nature of this calendar. Indeed, the use of this 364-day calendar does not depend on the regular observation of the sun. The main feature of this 364-day calendar seems to be the predominant importance of Sabbath-observance. This calendar makes sure that any other regular biblical holiday does not fall on the Sabbath, and does not interfere with its observance. That is why Feldman suggests the use of the term 'Sabbatarian calendar'.
"While many scholars have described this as a “solar” or “concordant” calendar because it mathematically synchronizes the rhythms of sun, moon, stars and Sabbath, I contend that this is best described ideologically as a Sabbatarian calendar because the Sabbath, observed by the weekly duty shifts of the priests in the Temple, is the central rhythm of time to which all others are subservient." This calendar differs significantly from the Babylonian lunar calendar that evolved into the 354-day Hebrew calendar known today. The scrolls' 364-day calendar divided the year into four quarters and recorded the feast days of the community. In this Sabbatarian (or Sabbatical) calendar, the Feasts were always fixed on the same day of the month, and typically occurred on different days from those indicated in the Babylonian-based calendar. Many of the Qumran texts featuring this calendar are contained in the rosters of weekly shifts or courses of temple service for the twenty-four priestly families, known as Mishmarot. There is some ambiguity as to whether the four cardinal days were at the beginning of the month or the end. The clearest calendar attestations give a year of four seasons, each having three months of 30, 30, and 31 days, with the cardinal day the extra day at the end, for a total of 91 days or exactly 13 weeks. Each season started on Wednesday, the fourth day of the week (Hebrew: יוֹם רְבִיעִי, romanized: yom rəb̲iʿi), every year. The writings often discuss the moon, but the calendar was not based on the moon's movement anymore than the indications of the moon's phases on a modern Western calendar indicate that that is a lunar calendar. A recent analysis of one of the last scrolls remaining to be deciphered has revealed it relates to this calendar. The sect used the word tekufah to identify each of the four special days, marking the transitions between the seasons. Qumran 364-day calendar has also been described as the “Jubilees-Qumran” calendar, the term first suggested by Annie Jaubert (1953). Indeed, a very similar 364-day calendrical system is also found in the Book of Jubilees, which also puts a great stress on Sabbath-observance. Jaubert further argued that the “Jubilees-Qumran” calendar is well attested in the early books of the Old Testament. Specifically, she pointed out that the patriarchs always journeyed on Sunday, Wednesday and Friday only, and not on the Sabbath. Thus, this constitutes the pattern of Sabbath work avoidance both in the Bible and in the Book of Jubilees. While the calendar contained in the Book of Enoch also shares some features with the Qumran 364-day calendar, the moon phases are much more important for the Book of Enoch. Also, the Sabbath-observance is not even mentioned in the Book of Enoch.
Structure The 364-day year is made up of twelve months, grouped in quarters. Each quarter contains three months; two of 30 days and one of 31 days, i.e. 91 days or 13 weeks, each quarter. The following table shows a quarter of the year. (The day names are provided only to facilitate understanding. Other than the weekly Sabbath, the other days were merely numbered in the calendrical texts.)
The year and each of its quarters starts on the same day, the fourth day of the week (Wednesday to us). This was the day when the sun was created in Genesis 1:14–18. However, the calendar as we know it is 364 days long, making it one and a quarter days short of a true year. This means, if it were put into practice, it would quickly lose synchronisation with astronomical events. Because of this, Lawrence Schiffman has stated the view that "this calendar was never really put to the test except perhaps for a short period". Uwe Glessmer has proposed on the basis of 4Q319 ("Otot") that the calendar was in fact intercalated, a week being added every seven years to keep it synchronised with the solar year. Roger Beckwith suggested that the discrepancy between the calendar and the true year, though noticed, may not have been of concern to the community that used the calendar.
Pentecontad calendar Another calendar attested at Qumran is the Pentecontad calendar. In this calendar, each fifty-day period was made up of seven weeks of seven days and seven Sabbaths, with an extra fiftieth day, known as the atzeret (meaning "stopping" or "ceasing" in Hebrew). This calendar is built upon “sevens”; the number seven played a big role. Accordingly, seven pentecontad cycles also constitute a year. Further, seven years constitute a sabbatical cycle, and seven of those constitute a jubilee. According to Stephen Pfann, the group of Qumran texts related to this calendar includes,
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