bahareh

What is YALDA'S NIGHT.
This is a short describtion about this festival:
Yalda, a Syric word imported into the Persian language by the Syric Christians means birth (tavalud and melaad are from the same origin). It is a relatively recent arrival and it is refereed to the "Shab e Cheleh Festival" a celebration of Winter Solstice on December 21st. Forty days before the next major Persian festival "Jashn e Sadeh" this night has been celebrated in countless cultures for thousands of years. The ancient Roman festivals of Saturnalia (God of Agriculture, Saturn) and Sol Invicta (Sun God) are amongst the best known in the Western world.
The last day of the Persian month Azar is the longest night of the year, when the forces of Ahriman are assumed to be at the peak of their strength. While the next day, the first day of the month "Day" known as "khoram rooz" or "khore rooz" (the day of sun) belongs to Ahura Mazda, the Lord of Wisdom. Since the days are getting longer and the nights shorter, this day marks the victory of Sun over the darkness. The occasion was celebrated in the festival of "Daygan" dedicated to Ahura Mazda, on the first day of the month "Day" .
It is not clear when and how the world "Yalda" entered the Persian language. The massive persecution of the early Christians in Rome brought many Christian refugees into the Sassanin Empire and it is very likely that these Christians introduced and popularized "Yalda" in Iran. Gradually "Shab e Yalda" and "Shab e Cheleh" became synonymous and the two are used interchangeably.
Today "Shab e Cheleh" is merely a social occasion, when family and friends get together for fun and merriment. Different kinds of dried fruits, nuts, seeds and fresh winter fruits are consumed. The presence of dried and fresh fruits is reminiscence of the ancient feasts to celebrate and pray to the deities to ensure the protection of the winter crops.