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" The other man smiled slyly and replied, "Same as always: the 25th of Kislev." This humorous comment makes an important point: the date of Jewish holidays does not change from year to year.
Holidays are celebrated on the same day of the Jewish calendar every year, but the Jewish year is not the same length as a solar year on the civil calendar used by most of the western world, so the date shifts on the civil calendar.
According to the account of Persian astronomer al-Khwarizmi (c.
780 – 850 CE), most of the features of its modern-day version were in place by the 9th century CE.
On average, the moon revolves around the Earth in about 29½ days.
The Earth revolves around the sun in about 365¼ days, that is, about 12.4 lunar months.
Years are either 12 or 13 months, corresponding to the 12.4 month solar cycle.The lunar month on the Jewish calendar begins when the first sliver of moon becomes visible after the dark of the moon.In ancient times, the new months used to be determined by observation.By simply entering a date into the Gregorian Calendar section of the Calendar Converter, the Hebrew Calendar Converter will display the equivalent date according to the Jewish Calendar.As well as showing the date conversion from Gregorian to Jewish, the free Hebrew Calendar Converter will also display the Sign of the Month in Hebrew.