The Sephirot (pl) are not a period of time. The Sephirot are aspects of HaShem (The Creator) when He interacts with the world. The Sephirot have no bearing on when Jews can or can't get married.

The Kabbalah Tree of Life is the term used to describe the 10 Sephirot used in the Jewish religion. The Tree of Life was adopted during the Renaissance period.

Through a careful study of the Tanakh, Jewish sages[who?] identified ten Sephirot (ten being the number of divine perfection). At their fundamental level, the ten Sephirot are a step-by-step process illuminating the Divine plan as it unfolds itself in our world. They are known by the following names/characteristics from highest to lowest:[citation needed] # Keter - Crown - Divine Plan/ Creator/ infinite light/ Ehyeh Asher Ehyeh - I AM THAT I AM (Supreme/ Total Consciousness) # Chokmah - Divine Reality/ revelation/ Yesh me-ayin - being from nothingness (Power of Wisdom) # Binah - Understanding/ repentance/ reason (Power of Love) # Chesed - Mercy/ Grace/ Love of (intention to emulate) God (Power of Vision) # Gevurah - Judgment/ strength/ determination (Power of Intention) # Tipheret - Symmetry/ balance/ compassion (Creative Power) # Netzach - Contemplation/ Initiative/ persistence (Power of the Eternal Now) # Hod - Surrender/ sincerity/ steadfastness (Intellectual/ Observational Power) # Yesod - Foundation/ wholly remembering/ coherent knowledge (Power of Manifesting) # Malkuth - Lower Crown - Kingdom/ physical presence/ vision and illusion (Power of Healing/ Accomplishment/ Level of Realization of Divine Plan) http://en.wikipedia.org/wiki/Sephirot

Some common Kabbalah symbols include the Tree of Life, the Star of David, the Hebrew alphabet, and the Ten Sephirot. These symbols are used to represent different aspects of mystical teachings in Kabbalah tradition.

It stems from a superstitious belief that demons or evil spirits would attack the pure and innocent, so a veil was used to disguise the innocent and pure so that the evil spirits would be fooled and not attack them.