I sometimes hear mention of certain days being called a "hidden yom tov." Examples include Rosh Chodesh, Hoshana Rabba and Erev Yom Kippur.
I have a few questions related to this:
- What does it mean that a day is a hidden yom tov, and what is the purpose?
- What is the source of this concept, and how do we know what days these are?
- What are all of the days that we know are hidden yamim tovim, and might there be additional days that we don't know about?
- Will there come a time when hidden yamim tovim are "revealed"? What will be different then?