The Suryasiddhanta
A classical Sanskrit text on Indian astronomy. Begin your journey through its chapters.
The Mean Motions of the Planets
मध्यमाधिकार
This chapter lays the foundational principles of astronomical calculation, defining units of time, cosmic cycles, and the mean revolutions of celestial bodies.
The True Motions of the Planets
स्पष्टाधिकार
This chapter provides detailed mathematical methods for calculating the true positions, motions, and various other astronomical elements of celestial bodies.
On Questions of Direction, Place, and Time
त्रिप्रश्नाधिकार
This chapter details the astronomical methods for determining directions, latitude, declination, and time using the shadow cast by a gnomon.
On Lunar Eclipses
चन्द्रग्रहणाधिकार
This chapter details the astronomical calculations for determining the occurrence, duration, and characteristics of solar and lunar eclipses.
On Solar Eclipses
सूर्यग्रहणाधिकार
This chapter elaborates on the methods for calculating astronomical parallax (lambana) and inclination (avanati), crucial for precise observations and eclipse predictions.
On Projection of Eclipses
छेद्यकाधिकार
This chapter systematically presents the geometric methods (Chedyaka) for diagrammatic representation and calculation of solar and lunar eclipses.
On Planetary Conjunctions
ग्रहयुत्यधिकार
This chapter details the astronomical computations, observational techniques, and astrological interpretations associated with planetary conjunctions and their specific characteristics, including which planet is considered victorious.
The Yoga of Fixed Stars
भग्रहयुत्यधिकार
This chapter describes the astronomical calculations, positions, and conjunctions of fixed stars and nakshatras, including their longitudes, latitudes, and the method for observing their alignments.
On Rising and Setting
उदयास्ताधिकार
This chapter elucidates the astronomical principles and calculations governing the risings, settings, and visibility of planets and stars in relation to the sun.
On the Moon's Cusps
चन्द्रशृङ्गोन्नत्यधिकार
This chapter details the astronomical computations for determining the moon's rising, setting, and its visible phases and crescent shape.
On Malefic Conjunctions
पाताधिकार
This chapter provides the astronomical methods for identifying and calculating inauspicious astrological conjunctions, notably Vyatipata, Vaidhruta, and Gandaanta, and outlines their detrimental effects and recommended spiritual remedies.
On Geography and Cosmology
भूगोलाध्याय
This chapter comprehensively describes the structure of the Earth, the cosmic creation, and the principles governing celestial bodies and time, revealed in response to fundamental inquiries.