Topic summary
Hijri year
Extracted from the Wikipedia article Hijri era.
The solar Hijri year corresponds closely with the Gregorian, but its year begins on the March equinox rather than on 1 January, so the era offset toggles between 622 years for almost three months and 621 years for over nine months. The beginning of the lunar Hijri year, on the other hand, moves earlier by at least ten days each solar year, because twelve lunar months amount to only 354 or 355 days.