Four Quarters · Four Transitions · One Sacred Year

See the quarter geometry first; open the specialist term, evidence, and reconstruction notes only when useful.

Depth

Q1
Days 1–91Q2
92–182Q3
183–273Q4
274–364364days

Tekufah marks a turning or boundary in the four-quarter structure—not a fifth season.

Quarter 1

Spring / First Quarter

Days 1–91

Nisan through the first Tekufah transition

Quarter 2

Summer / Second Quarter

Days 92–182

Second quarter and Tekufah Tammuz relationship

Quarter 3

Fall / Third Quarter

Days 183–273

Third quarter and Tekufah Tishrei relationship

Quarter 4

Winter / Fourth Quarter

Days 274–364

Fourth quarter and Tekufah Tevet/Nisan relationship

Evidence and reconstruction notes

The four 91-day quarter structure is part of the governed 364-day calendar model. Exact civil anchoring, AM chronology, and leap-week compatibility rules are model settings and remain visible in Calendar Research & Sources.

Open Calendar Research & Sources