What does Thai Songkran festival represents and how many days does it last?

Context: Songkran is a term derived from Sanskrit संक्रान्ति saṅkrānti meaning 'to move' or 'movement'. It derives from the movement of the sun from one position to another in the zodiac. According to its literal meaning in Sanskrit, a Songkran occurs every month. However, the period that Thai people refer to as Songkran happens when the sun moves from Pisces to Aries in the zodiac. The correct name for this period should actually be Maha Songkran because it coincides with the arrival of a New Year. The Songkran festival is, therefore, a celebration of the New Year in accordance with the solar calendar. The celebration covers a period of three days: 13 April is regarded as Maha Songkran, the day that the sun moves into Aries on the zodiac or the last day of the old year. The next day, 14 April is called Wan Nao, the transitional day between the old and the new years, and 15 April is called Wan Thaloeng Sok, New Year's day itself.

Answer: Thai Songkran festival is a New Year celebration in Thailand according to solar calendar. Songkran happens when the sun moves from Pisces to Aries in the zodiac. The festival covers three days period from 13 April to 15 April.