Ratha Saptami is the Saptami that falls on Shukla Paksha in the month of Magha. Saptami Tithi is dedicated to Lord Surya, Surya is said to be sitting on a chariot with seven white horses. It is believed that Lord Surya Dev started enlightening the whole world on Rath Saptami, i.e. it was also considered as the birthday of Lord Surya. Hence this day is also defined as Surya Jayanti.
According to the Hindu calendar, during the Shukla Paksha, the 7th day in the month of Magha, i.e. Saptami Tithi, is the festival of Ratha Saptami.
Saptami date ends - February 19, 2021 at 10:58 A.M.
The story of Rath Saptami or Maghi Saptami is given in the Puranas as follows. It is said that a woman named Ganika had never done any charity work in her whole life. When that woman's end came, she went to Vashistha Muni. The woman told the sage that if I have never done any charity, how will I get liberation. The sage said that on the seventh day of the bright fortnight of Magh month, it is Achala Saptami. On this day one gets a thousand times of the charity and charity than any other day. On this day, take a bath in the holy Nandi and give water to Lord Surya and should donate a lamp and eat it without salt once a day. By doing this one attains great virtue. The Ganesha fasted and practiced everything on the day of Saptami, told by Vasishta Muni. A few days later the courtesan renounced his body and had the privilege of becoming the head of the apsaras of heaven's King Indra.