The sun-based calendar was used long before the moon-based calendar was created. It has changed over time, depending on the changes the earth has experienced. Here is an explanation of that calendar, followed by a working model that is in use today by certain Seventh-Day groups and a very few others, and that the prophets say will be brought back into service as the common calendar around the world when a king is restored to the returned remnant of the 10 northern tribes of Israel.
The working model of the Qumran Jubilee Calendar 2000 to 2050 CE – The Working Model in matrix format done in Microsoft Excel then transferred to Adobe pdf for general access and printing purposes, cross-referenced with the Gregorian calendar. This is a simplified version as of December 4, 2016 to correct a one-day error in the dating of the week of Feast of Unleavened Bread caused by placing the Passover on the 15th instead of the 14th as it is practiced.
The Gregorian to Jubilee + Sunspots matrix is cross-referenced between the Qumran calendar and the Gregorian calendar, with sunspots listed so that those persons who believe that the number of sunspots affects the vitality of the persons born under them can test their theory. Please note that the Gregorian year 1950 was the 350th year in the Qumran cycle when only 7 days instead of the usual 14 days are intercalated during the seventh month.
The common “kitchen calendar” used by the people (the matrix version was used almost exclusively by the priests and temple servants) for planting their crops, breeding their cattle, and day-to-day activities.