This year, the Islamic and Jewish new years coincide.
In 2017, the Jewish New Year (Rosh Hashanah) and the Islamic New Year (Hijri) overlap over September 22nd. This year, the Jewish New Year (year 5778) begins at sundown on 20th September and is celebrated until sundown on 22nd September. The Islamic New Year (1439 AH) is marked from sundown on 19th September until sundown 20th September.
Both the Muslim and the Jewish calendars are based on the moon, as opposed to the sun-based Gregorian calendar. This means that holy days and festivals are on different dates of the Gregorian calendar each year. While both are lunar calendars, they are still each distinct from the other. This is due to the different ways they use to align with the solar cycle.
In both religions, the new year signals a period of reflection and atonement for many people. A new year can mean a fresh start, another opportunity to do better than the year that has passed.
Whether you will be celebrating one of these holidays or not, this is an excellent opportunity to reflect on the past year and think about how you would like the next one to unfold.