Shani refers to the planet Saturn and is one of the nine heavenly objects known as Navagraha in Hindu astrology. Shani is a form of Lord Shiva. Shani is also a male deity in the Puranas, whose iconography consists of a handsome figure carrying a sword or other weapon, and sitting on a crow. Shani as a planet appears in various Hindu astronomical texts in Sanskrit, such as the 5th century Aryabhatiya by Aryabhatta, 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 Shani 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 as divine knowledge linked to deities.