Edited
For example, Tuesday is, say, corresponds with the second day of the week (pretending the week starts on Monday). Which day of the week does the Shabbat refer to on the Hebrew Calendar?
Does the Hebrew Calendar list the days of the week like the Gregorian Calendar does Sunday-Saturday?
That, and...
If we counted the rotation of the earth from Sunday sorry, today, (without looking at the calendar) to the seventh day, whichever day that the seventh falls on would technically be the seventh day of the month. If that days falls on a Sunday or Monday, accidentally, wouldn't that be technically correct or do Jews go by what's written rather than the actual rotation of the earth-even though they may not be aligned with each other, if we missed a leap year?