Wasn't the Sabbath based on the new moon indicating the start of a new month and the Sabbath accordingly was seven days later from its sighting in ancient times and not necessarily Saturday as we have from the Roman calendars?
closed as unclear what you're asking by Scimonster, Isaac Moses♦, Gershon Gold, Shmuel Brin, Yishai Apr 27 '15 at 19:14
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The counting of the sabbath cycle (days) is not a lunar based one. Here is an excerpt from http://www.chabad.org/library/article_cdo/aid/1103696/jewish/How-Do-We-Know-Which-Day-is-Shabbat.htm :
We were first commanded to keep Shabbat in the desert shortly after we left Egypt. How did we know when to keep it? In Exodus 16, we are told that during our journey in the desert, manna fell every day except for one—the Shabbat. So what did we eat then? A double portion fell every Friday so that we would have what to eat the next day as well. On the first Friday after the manna began to fall, the people were surprised to see so much manna—double that which they had received on each of the past five days. When they came to ask Moses about this phenomenon, he revealed that the next day would be the Shabbat and that no manna would fall at all.
For more info, check out this question. How do we know that the civil Saturday is the correct Shabbat?