We may ascertain that the Law was given on the Sabbath day, by noting that Sivan 1, 2, and 3, were days of travel.  Sivan 4 and 5 were days of preparation.  This means that none of those days can be the Sabbath.  If Sivan 6 was a Sunday, then Sivan 5 would be a Sabbath, so Sunday is ruled out.  Also if Sivan 6 was a Monday, Tuesday, Wednesday, or Thursday, then Sivan 1, 2, 3, or 4 would be a Sabbath.  This rules out Monday, Tuesday, Wednesday and Thursday,  and leaves us with only FRIDAY and the SABBATH as possible days for the giving of the Law.  Since neither is Sunday, the Sadducean view is wrong.      If Yahweh commanded Israel to have a holy convocation on the Sabbath for the purpose of worship, then why would he invite the 70 elders up to the mount on any day other than the Sabbath to meet with him?  And why would Sabbaths be counted as well as days (Lev. 23:15-16) unless the Sabbath had great significance in the date of the first Shavuot?  In fact the Sabbath date for the first Shavuot is confirmed by Astronomy.      Back.