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lunisolar calendar indicates both the moon phase and the time of the solar year.
I believe that the Quran came to a society, which used a calendar. This is clear in Ver. 10:5 in Quran. According to this calendar the Ramadan month will be in a fixed season every year. And also the forbidden 4 months will be in the same season. Those are the seasons of the reproduction of animals. And that makes sense to save our environment.