I was curious why Islam uses the lunar calendar. The solar calendar seems more pragmatic because the same date falls in the same season every year. E.g. thanks to the solar calendar, it is easy to know that January 1, 1786 was winter in Copenhagen. It is much harder to derive the season in different geographic locations based on a lunar date.
The only advantage to the lunar calendar I can think of is to diversify the difficulty of the Ramadan fast, to make it easier in some years and harder in others. But are there any other benefits of and reasons why Islam uses it?