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In page Hebrew calendar:

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While imprisoned in Auschwitz, Jews made every effort to observe Jewish tradition in the camps, despite the monumental dangers in doing so. The Hebrew calendar, which is a tradition with great importance to Jewish practice and rituals was particularly dangerous since no tools of telling of time, such as watches and calendars were permitted in the camps.[1] The keeping of a Hebrew calendar was a rarity amongst prisoners and there are only two known surviving calendars that were made in Auschwitz, both of which were made by women.[1] Before this, the tradition of making a Hebrew calendar was greatly assumed to be the job of a man in Jewish society.[1]