text: Planet Brihaspati as a planet (Jupiter) appears in various Hindu astronomical texts in Sanskrit, such as the 5th century Aryabhatiya by Aryabhata, the 6th century Romaka by Latadeva and Panca Siddhantika by Varahamihira, the 7th century Khandakhadyaka by Brahmagupta and the 8th century Sisyadhivrddida by Lalla. These texts present Brihaspati as one of the planets and estimate the characteristics of the respective planetary motion. Other texts such as Surya Siddhanta dated to have been complete sometime between the 5th century and 10th century present their chapters on various planets with deity mythologies.
  The manuscripts of these texts exist in slightly different versions, present Brihaspati's motion in the skies, but vary in their data, suggesting that the text were open and revised over their lives. The texts slightly disagree in their data, in their measurements of Brihaspati's revolutions, apogee, epicycles, nodal longitudes, orbital inclination, and other parameters. For example, both Khandakhadyaka and Surya Siddhanta of Varaha state that Brihaspati completes 364,220 revolutions every 4,320,000 earth years, an Epicycle of Apsis as 32 degrees, and had an apogee (aphelia) of 160 degrees in 499 CE; while another manuscript of Surya Siddhanta accepts the revolutions to be 364,220, but revises the apogee to 171 degrees and 16 seconds and the Epicycle slightly.
  The 1st millennium CE Hindu scholars had estimated the time it took for sidereal revolutions of each planet including Brihaspati, from their astronomical studies, with slightly different results: