Prayag Kumbh has special significance because it is held after 12 years at the confluence of Ganga, Yamuna and Saraswati. According to astrologers, when Jupiter enters Aquarius and Sun enters Aries, then Kumbh Mela is organized in Prayag(Allahabad)

second thing is or other beliefs, the festival of Kumbh is held in Prayag on the day of Amavasya when Jupiter and Sun and Moon enter Capricorn in the Aries zodiac. According to another calculation, on the entry of Sun in Capricorn and Jupiter in Taurus, Kumbh festival is organized in Prayag(Allahabad)