Introduction jewish calendar, A luni-solar seasonal calendar actually, the jewish calendar might best be described as "luni-solar." since every lunar cycle runs roughly 29.5 days, the jewish year. Dynarch calendar documentation, This is the documentation of the new dynarch calendar (“jscal2”). note that it is not compatible with our old calendar project. the new calendar has less. The british monetary system decimalization, The british monetary system before decimalization. g. vinton palazzolo asked a question on the calendar mailing list about the practicality of the mixed-radix.