what is a luni-solar calendar?
A purely solar calendar, is a calendar in which a year is defined as the time required for the earth to complete one orbit around the sun. this period is 365 days, 5 hours, 48 minutes, 45.51 seconds. Dividing this period into twelve, we get the solar month- 30 days, 10 hours, 29 minutes, 3.8 seconds. The Gregorian calendar is an example of a purely solar calendar. A purely lunar calendar, in which a year is the time required to the moon to complete 12 orbits around the earth. this period is 354.37 days. The Islamic calendar is an example of a purely lunar calendar. the feature of the lunar calendar is that has no connection with the seasons, since the lunar year is shorter then the solar year, the lunar calendar is going “back” season-wise every year in 11-12 days, and will come back to the same relation it has with the solar year approximately every 33 years. (that means that the same holiday can be once in the summer and after a few years- in the summer. The Islamic calendar is an ex
