The Tetraeteric calendar is a lunar (partially lunisolar) calendar invented by Hellerick in 2000. The months are grouped into four-year terms tetraeterides (singular tetraeteris). One tetraeteris consists of 49 lunar months, or 1447 days without exception. Months of tetraeteris are grouped into four solar cycles ("years") of twelve months similar to lunar years, with addition of yet one embolismic month that does not belong to any solar cycle.
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