Re: Which calender system is Islamic?
I guess you missed that part, calculating a month is so simple by viewing crescent you can determine the first day of a month and when you see full moon its the mid of the month and when you see another new moon thats the beginning of new month.
9:36 "Lo! the **number of the months with Allah is twelve months* by Allah's ordinance in the day that He created the heavens and the earth. Four of them are sacred: that is the right religion."*
When you finish calculating 12 months in the way explained above you can calculate a full year.
"Can you just (told) me how can your determine the number of years and count of time leaving apart the Sun?"
Yes I told you before and am telling you again.