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[ Surya Prajnapti Sutra
In a day of twelve muhurtas, there are four one-eighth muhurtas,
Thus, when the sun enters (the zodiac) in this way, the mandalas (zodiac signs) move one after another, and as they move, the half-mandalas (half-zodiac signs) in those respective regions move one after another, and as they move, the sun moves in the eastern direction, in the northern half-mandala, for the entire duration,
Therefore, when the sun moves in the northern half-mandala for the entire duration, it is said to be in the Uttara Kattha Patti (northern solstice) for eighteen muhurtas in a day, when it is twelve muhurtas in the Raa (equinox),
This is for the two half-years, this is for the half-year of the two half-years, this is for the year, this is for the year of the year.