Believers who have developed an interest in, and desire to study about, the biblical holy days laid out in Leviticus 23 will have noticed that the dates of these feasts appears to shift from year to year.
Well they do, if you are marking these events on the Gregorian calendar – the solar calendar system used by most of the Western world. Actually the Biblical holidays are on the same day every year, the same day of the Jewish calendar that is.