It is believed that the mother Goddess Earth or the divine wife of Lord Vishnu undergoes menstruation during the first three days. The fourth day is called Vasumati Snana, or ceremonial bath of Bhudevi. The term Raja came from the Sanskrit word 'Rajas' which means menstruation and when a woman menstruates, she is called 'Rajaswala' or a menstruating woman, and in medieval times the festival became more popular as an agricultural holiday marking the worship of Bhudevi, who is the wife of lord Jagannath.