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A Box Month is a month in which the first day of the month begins on a Sunday and the calendar of the month forms a perfect [rectangle]. The only month in which this can occur is [February], since it has 28 days. The occurrence of this event is quite rare. Since a Box month cannot occur on a leap (due to the 29 days), the pattern of re-occurrence follows a 6-11-11...6-11-11 year [interval]. For example the years in which a Box Month occur are 1981-1987-1998-2009-2015-2026, following the 6 yr, 11 yr, 11 yr pattern. This rare event is celebrated throughout the month in commemoration of this rarity within the Calendar.
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