Disclaimer: I am not a religious Jew, this question is only out of curiosity.
I understand that observant Jews observe Shabbat from Friday night to Saturday. And from this question and this it seems that it is important that this happens on the correct and accurate time of week.
My question is, how do you know that the Saturday that everyone is using is correct (as in, exactly 7*x days after God's rest day)? Is there any record on who began declaring that Monday is Monday, etc. until it is used by today's civil calendar? And how can we know that the sequence is never broken? (for example, the sequence of calendar time of year was broken when there is a switch from the Julian calendar to Gregorian calendar)
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