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Here, we will briefly compare the topics discussed in the Samavayanga with the Surya Prajnapti.
The first Samavaya of the Samavayanga describes the Ardra, Chitra, and Swati constellations in the 23rd, 24th, and 25th sutras, respectively. This description is also found in the Surya Prajnapti 692.
The second Samavaya, from the fourth to the seventh Samavaya, describes the stars of Purva Phalguni, Uttara Phalguni, Purva Bhadrapada, and Uttara Bhadrapada. This is also found in the Surya Prajnapti 693.
The third Samavaya, from the sixth to the twelfth sutra, describes the constellations Mrigashira, Pushya, Jyeshta, Abhijit, Shravana, Ashwini, Bharani, etc. This description is also found in the Surya Prajnapti 694.
The fourth Samavaya, in the seventh, eighth, and ninth sutras, describes the four stars of the Anuradha, Purva Ashadha, and Uttara Ashadha constellations. The description of these stars is also found in the Surya Prajnapti 695.
The fifth Samavaya, from the ninth to the thirteenth sutras, describes the five stars of the Rohini, Punarvasu, Hasta, Visakha, and Dhanishta constellations. This description is also found in the Surya Prajnapti 696.
The sixth Samavaya, in the seventh and eighth sutras, mentions the six stars of the Krittika and Ashlesha constellations. This is also mentioned in the Surya Prajnapti 697.
The seventh Samavaya, from the seventh to the eleventh sutras, describes the stars and their gates of the Magha, Krittika, Anuradha, and Dhanishta constellations. This is also found in the Surya Prajnapti 698.
The ninth sutra of the eighth Samavaya states "Atthanakkhatta Chandem..." and the Surya Prajnapti 699 also describes the eight constellations of Krittika, Rohini, Punarvasu, Magha, Chitra, Visakha, Anuradha, and Jyeshta that form the Pramard Yoga with the Moon.
The fifth, sixth, and seventh sutras of the ninth Samavaya describe the Abhijit constellation's conjunction with the Moon and state that the Ratnaprabha is a star nine hundred yojanas above the Earth. This description is also found in the Surya Prajnapti 700. The only difference between the Samavayanga and the Surya Prajnapti is that the Samavayanga states the conjunction time of Abhijit with the Moon as 9 muhurtas, while the Surya Prajnapti 701 states it as 12 muhurtas.
The second, third, and fifth sutras of the eleventh Samavaya describe the beginning of the Jyotish chakra and mention the eleven stars of the Mula constellation. This description is also found in the Surya Prajnapti 702.