The Suryasiddhanta
A classical Sanskrit text on Indian astronomy. Begin your journey through its chapters.
The Yoga of Principles of Time and Planets
Kāla-Graha-Siddhānta Yoga
This chapter establishes the fundamental principles for understanding cosmic time cycles and calculating the mean positions of celestial bodies in Vedic astronomy.
The Yoga of Planetary Computation
Graha Gaṇita Yoga
This chapter outlines the mathematical methods for accurately calculating the positions, speeds, and various motions of celestial bodies.
The Yoga of Gnomon and Shadow
Śaṅku Chāyā Yoga
This chapter outlines the systematic application of gnomon and shadow measurements for precise astronomical and astrological calculations, including directions, latitude, planetary positions, and ascendants.
Yoga of Eclipse Calculation
Grahaṇa-gaṇita Yoga
This chapter details the mathematical methods and rules for calculating and predicting solar and lunar eclipses and related celestial phenomena.
The Yoga of Parallax and Zenith Distance
Lambanāvanati Yoga
This chapter systematically describes the methods and calculations for parallax (lambana) and zenith distance (avanati) in astronomical computations, particularly for accurate celestial observations and eclipse prediction.
The Yoga of Geometric Knowledge
Chedyakajñāna Yoga
This chapter meticulously explains the geometric principles and methods for drawing and calculating the various aspects of solar and lunar eclipses.
The Yoga of Planetary Battles and Conjunctions
Graha Yuddha Samāgama Yoga
This chapter elucidates the astronomical methods for calculating, observing, and interpreting the conjunctions and conflicts of planets and stars.
Yoga of the Ascertainment of Star and Planetary Positions
Tārāgraha-Sthiti-Nirūpaṇa Yoga
This chapter outlines the astronomical and astrological methods for determining the positions, latitudes, and conjunctions of stars, constellations, and planets.
The Yoga of Precise Knowledge of Rising and Setting
Udayāstamaya-parijñāna Yoga
This chapter details the astronomical principles, calculations, and specific conditions for the heliacal rising and setting of planets and constellations, and their visibility.
The Yoga of Lunar Operations
चन्द्रकर्मयोग
This chapter details the astronomical calculations and geometric methods for determining the Moon's rising, setting, phases, illuminated portion, and crescent shape.
The Yoga of Calamitous Conjunctions
Vyatīpāta Yoga
This chapter explains the astrological calculation and inauspicious nature of Vyatīpāta and Vaidhṛta yogas, advising caution in all worldly endeavors during these periods.
The Yoga of the Spiritual Arrangement of Worlds
Adhyātma-Loka-Vyavasthā Yoga
This chapter, presented as a supreme spiritual secret, describes the creation, structure, and astronomical dynamics of the various worlds and celestial bodies within the cosmos, all rooted in the Supreme Brahman.
The Chapter on Celestial Spheres and Instruments
Gola Yantra Yoga
This chapter elucidates the principles and construction of terrestrial and celestial globes, along with various astronomical instruments for observing planetary movements and accurately measuring time, emphasizing knowledge passed down through a guru.