Sepandārmazgān (in Persian: سپندارمذگان)^[1] is the celebration day of love and earth in ancient Persian culture. This day is dedicated to Spenta Armaiti, Spandārmad in Middle Persian, the Middle Iranian language/ethnolect of Southwestern Iran that during Sassanid times (224-654 CE) became a prestige dialect and so came to be spoken in other regions as well.

It is celebrated the 29th of Bahman in Iranian calendar. Modern folklore dates the celebration to ancient times and Zoroastrian tradition. Sepandarmazgan is the celebration day of Love, Friendship and Earth in ancient Persian culture.

According to Iranian tradition, the day of Sepandarmazgan was held in the Great Persian Empire in the 20th century BC. That is the national title of the Earth and the Earth is the symbol of love & modesty. Persians have a rich culture with many great feasts based on natural occasions that have been mixed up with happiness and Joy. In the feast of Sepandarmazgan, the Earth was worshiped and women venerated. On this day, women and girls sat on the throne and men and boys had to obey them and bring them presents and gifts. In this way, men were reminded to acclaim and respect women. Sepandarmaz is another name for mainyu (earth) meaning Holy, Humble and Passionate. Sepandarmaz is also Earth Guardian Angel. It is the symbol of humbleness. It means modest toward the entire creation. These are the qualities attributed to Earth that spreads beneath our feet, thus the symbol of modesty and love. As human beings, there are creatures that we find unpleasant and repulsive, but Earth is not like us. She embraces all creatures the same and loves them the same; like a mother who loves all children alike, even when they are ugly. In ancient Persian culture, mother is symbolized by Sepandarmaz or earth.

all information are from http://en.wikipedia.org/wiki/Spandarmazgan