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The Hermetic Lunar Week Calendar (HLWC) is a proposal for calendar reform by Peter Meyer. It is a lunisolar calendar which uses the lunar week (a quarter of a lunation). Each week has normally 7 days, sometimes 8, occasionally 6 and rarely 9 (average 7.382647 days). HLWC time is 6 hours behind of conventional time. Each week begins on the HLWC day after the dark moon (new moon), half moon (waxing), full moon or half moon (waning). Each month starts on the HLWC day after the dark moon (new moon) and each year starts on the HLWC day after the closest dark moon (new moon) to the vernal equinox. Each month has 29 or 30 days. Each year has 12 or 13 months. The names of the months are:
- De Quincy
- McKenna (leap month, occurs every 3 or 2 years in no cycle)
The names of the weeks of the months are Weekone, Weektwo, Weekthree and Weekfour. The names of the days of the week in four possible weeks are:
|6 days||7 days||8 days||9 days|
In the Hermetic Lunar Week Calendar, months are observably related to the phases of the Moon. The Julian/Gregorian calendar lacks any correlation with the lunar cycle. The HLWC date is written as year-month-week-day. For example, 2006 October 21 Saturday corresponds to 5006 Grof Weekfour Moonday. This calendar doesn't use the 7-day week. This calendar is timezone independent and calculation is based on the HLWC GMT timezone. In the GMT timezone, the dark moon (new moon), half moon (waxing or waning) and full moon always occur on Moonday.