We often hear questions such as, “When is Rosh Hashanah this year?” Or, “When are we celebrating Hanukkah this year?” The date is set in the Hebrew calendar, which is lunisolar, meaning it is based on both a lunar cycle and a solar one, unlike the Gregorian calendar, which is based only on the solar cycle, so the date of the holidays does not correspond from one year to another the same date in the Gregorian calendar.
On the calendar page, „luah‟ in Hebrew, from the image, the first day of Rosh Hashanah (New Year) is in 1 Tishrei 5781 which corresponds to September 19, 2020. In 2021, the first day of Rosh Hashanah, 1 Tishrei 5782 will be celebrated on September 7, 2021. We will therefore have to consult a Hebrew calendar and a calendar converter to find out the day when the holiday falls, also taking into account the fact that it all starts on the eve. One method available to everyone to calculate the current Jewish year is to add 3761 to the calendar year in the usual calendar. For example: 2020 + 3761 = 5781, valid from the day of the Jewish New Year that begins sometime in the fall.
