To understand the Jewish piety
Why do Jewish holidays change every year
Nathan Stein Mayor
September 26, 2025
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The 19th -century Jewish calendar from Italy is located in the Jewish Museum, London. Ethan Dual WhiteFor, for, for,. CC Bai-SA 4.0Through the Vikimidia Commons
Ever wondered why holidays like Hanuka and Passover appear to be changing years by year? The simple answer is that these holidays are not used by Gregorian piety used by many countries, but by Jewish piety. However, there are not just the difference between these calendars of the year. There are years itself. Although many elements of this calendaric system can be seen in the Bible pages, other features are only developed later. So, what is the Jewish calendar exactly?

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The reconstruction of the geyser calendar, which has been discovered so far, is written in an alphabet script. Courtesy Nathan Stan Mayor, BA.
As the name shows, modern Jewish piety is used today by Jewish religious settings as well as by the state of Israel. This calendar was first established by the Jewish Sage Hill II in 358/9 CE. It was very based on previous Jewish calendars, and has since been different. Many of the features of modern Jewish piety will be familiar with people who use Gregorian piety, including seven days of weeks and 24 hours. Within these features, the most important differences are that the week is the last day of the Jewish week, and every day ends in Sundwan instead of midnight.
Where the calendar begins to be removed more significantly, it is calculated in the months. Like many calendars, Jewish piety is also luncler, which means that it tries to connect months according to the lunar cycles according to the solar cycle. Thus, the Jewish calendar consists of 12 months, each has 29 or 30 days. Nevertheless, since the lunar and solar cycles are not aligned at all, the Jewish calendar uses an interconnected month, which is included every several years an extra month. In the Bible era, a new month began with the physical sight of a new moon. However, between the first and the 12th centuries, it was gradually replaced by a model of mathematics.
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As can be seen throughout the Bible, months of names are very different from those used in the Gregorian calendar. Just as the Gregorian month was taken from the Roman Julian calendar, the Jewish months were named from Mesopotamia, especially during the second thousand BCEs, the name and system of this month was regularly made in the religious capital of Nipur. This debt is easily seen in the names of the first two Jewish months (Nissan and Ier), compared to the first two mesopotamine months (Nissanm and Ayarm).
An interesting feature of the Jewish piety is its own disagreement with the beginning of the year, with both civil and a church New Year. Nevertheless, Rosh Hashana’s festival (literally, “Head of the Year”), which takes place in September or October, is considered the first day of the year to count the New Year. So, how do Jews count the years?
As can be expected, the Jewish piety has nothing to do with the birth of Jesus in the years (Inu Domini). Instead, the years of Jewish piety are calculated based on the age of the world (Inu Mandi) This age is determined in the second century CE based on the Bible’s text by Rabi Yus Ben Halaf. According to his calculation, the world was formed on Monday, October 7, 3761 BC. Thus, if you want to know what this Jewish is, then add only 3761 in the current Gregorian year.

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Determining the times, and thus what year it is, has always been difficult. Many ancient cultures used regular years, in which the present king or Queen took the name of this year through the number of years of Raj. This system is often seen in the Hebrew Bible. However, today this system is very common, most of the modern systems work according to a fixed start date. Although the Jewish year is based on the age of the world’s calculation, the Gregorian system is based on the birth of Jesus, which is calculated by the sixth century monk Daniees Exigos. However, his calculations had ended a few years. Gregorian system divides dates into two trips: after the birth of Jesus (ad: Inu -domino) And before the birth of Jesus (BC: before Christ).
In recent history, the AD and BC have begun to replace the more neutral CE (common period) and BCE (before the general age), which has been used by the majority of scholars in the fields of archaeological and Bible study. Although this change in terms is controversial, it is certainly not the first time such a change has occurred, in which the existing use of AD was only more than a thousand years, and the BC is more modern and clearly English term. Meanwhile, the term “ordinary period” (or imitation terms) was already in use at least 1615.
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