The Jewish calendar, like the Islamic calendar, is a lunar calendar. But 12 lunar months comes out to 354 days, so the calendar drifts backwards about a third of a month each year. However, there is a verse that states that Passover is in the spring, so approximately every 3 years (7 times per 19 years of you want to be specific) there is a leap month added to bring things back into sync. There is no similar verse concerning Ramadan, so the Islamic calendar just loses 11 days every year and they’re fine with it.
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