Real Calendar 13 Months. Discover the magical world of the celtic moon calendar, a celestial journey through 13 lunar months. It is an example of a perennial calendar, as every date always occurs on the same weekday.
Our modern calendar, known as the gregorian calendar, consists of 12 months, each with varying numbers of days, but did you know that there was a time when there were 13 months in a year,. In 1902, cotsworth presented a design for a calendar of 13 months where every month was exactly 28 days.