The biblical Sabbath follows the new moon cycle. Therefore, Sabbath could fall on any day of the week that we call Sunday thru Saturday. You need to wait 1 or 2 or 3 days for the new moon, so Sabbath may or may not be a 7 day cycle at the new month. Once the new moon appears, that is day 1, then day 8, day 15, day 22, day 29 are Sabbaths. Then you wait for the new moon cycle 1 to 3 days again.
The biblical Sabbath follows the new moon cycle. Therefore, Sabbath could fall on any day of the week that we call Sunday thru Saturday. You need to wait 1 or 2 or 3 days for the new moon, so Sabbath may or may not be a 7 day cycle at the new month. Once the new moon appears, that is day 1, then day 8, day 15, day 22, day 29 are Sabbaths. Then you wait for the new moon cycle 1 to 3 days again.