Siddhanta refers to a principle or doctrine, often used in the context of philosophy, religion, or science. In Hinduism, it can denote established teachings or beliefs, particularly those found in texts like the Vedas or Upanishads. Siddhanta serves as a guide for understanding moral and ethical conduct. In mathematics and astronomy, Siddhanta can refer to specific theories or rules that govern calculations and observations. For example, the Aryabhatiya by Aryabhata outlines astronomical principles and calculations, contributing significantly to ancient Indian science. These doctrines help in forming a structured understanding of various subjects.