5 Siddhantas Astronomical knowledge was very well developed during the Vedic and Vedang periods and was further developed and updated in subsequent periods. सिद्धान्त is one of the sub-branches of Ganit Skandha. For various branches of Astronomy see https://intrestingcosmos.blogspot.com/2024/03/ -of 01 March 2024 Knowledge of the position of the Sun, Moon, and other planets was required for calendrical, religious, and daily rituals. The history of astronomical works can be assessed from the oldest known group of 5 ancient सिद्धान्त known as पंचसिद्धांतिका written by Varahmihira (500 CE) These 5 सिद्धान्त are पितमहः, वसिष्ठ, रोमक, पौलिश , सौर Varahmihira in his पंचसिद्धांतिका says that the सिद्धान्त written by Paulisa is fairly accurate, but not as accurate as Saura/Surya Siddhant. The accuracy of others is doubtful. These Siddhantas outline methods for calculating the me...
The cosmos has a lot of hidden facts, and we are not aware of them. Humans have been learning from the heavens and updating their lives since ancient times. In doing so, we have forgotten the efforts of the previous generation who had opened the cosmos to us. Some facts we knew, but had no proof of, as we unfold and update, the facts confirm their findings. My effort is to bring out these fundamentals as given in ancient Hindu texts