Cosmos & Calendar
The 364-Day Calendar
A schematic solar year argued as cosmic law, and a live dispute at Qumran.
The short answer
The Astronomical Book sets out a 364-day year of exactly fifty-two weeks, in which every festival falls on the same weekday annually. Texts from Qumran show a community that took this calendar seriously enough to treat the competing lunar reckoning as an error with consequences.
Broad agreement among historians of the Second Temple period.
Why the number is chosen
364 divides cleanly by seven. A year built on it never drifts across weekdays, which makes the festival cycle fixed and, in the text's framing, not adjustable by human authorities. The astronomical cost is roughly a day and a quarter of drift per year against the actual solar year.
The Aramaic material recovered at Qumran is longer than the surviving Geʽez, so the calendar treatise most readers meet is an abridgement.
In the text
Chapters that carry this
Read the passage rather than taking the summary on trust.
Chapter 72
Mapped in the structure guide; the full rendering is not published yet.
Chapter 74
Mapped in the structure guide; the full rendering is not published yet.
Chapter 75
Mapped in the structure guide; the full rendering is not published yet.
Chapter 78
Mapped in the structure guide; the full rendering is not published yet.
Chapter 82
Mapped in the structure guide; the full rendering is not published yet.
Related
Connected concepts
Keep going