The asterisk denotes a day of celebration not commanded in Torah, but rather created by Biblical events. After the 2nd Temple was destroyed the rabbis chose 6 of Sivan for Shavuot, always counting 50 days from Nisan 15. History reports that the Kohenim of the Temple counted 50 days from Yom HaBikkurim, which itself is always the first day of the week after the Passover, therefore the Scriptural Shavuot is always on the 7th first day of the week after Passover.
Festivals begin at sundown the prior Gregorian day.
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