About This Blog – Ancient Astronomical Research

 Welcome to *Ancient Astronomical Research*, a blog dedicated to exploring the science, mathematics, and wisdom of ancient Indian astronomy.


Our focus areas include:

• Surya Siddhanta  

• Timekeeping systems used in ancient India  

• Jantar Mantar observatories  

• Planetary motion calculations  

• Sunrise, sunset, and shadow-based time measurement  

• Comparison with modern astronomy and time zones


This blog aims to simplify complex astronomical concepts and present them in a research-oriented yet beginner-friendly manner.


If you are curious about ancient science, sky observation techniques, or Indian mathematical astronomy — you are in the right place.


Thank you for visiting and supporting this research journey.


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Surya Siddhanta: Ancient Wisdom for Modern Timekeeping by Yogesh Tiwari

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  Surya Siddhanta: Ancient Wisdom for Modern Timekeeping By Yogesh Tiwari   Contents Surya Siddhanta: Ancient Wisdom for Modern Timekeeping . 1 About the Author . 7 Preface . 8 Chapter 1 – Introduction to the Surya Siddhanta . 8 Chapter 2 – Historical Context and Origins . 9 Chapter 3 – Cosmological Framework in the Surya Siddhanta . 10 Chapter 4 – Mathematical Principles and Units of Measurement . 11 1. Fundamental Mathematical Concepts . 11 2. Units of Angular Measurement . 12 3. Time Measurement Units . 12 4. Linear and Distance Measures . 12 5. Geometric Framework . 12 6. Calculative Philosophy . 12 Chapter 5 – Solar Motions and Their Calculations . 13 1. The Sun’s Path – The Ecliptic . 13 2. Mean and True Motion . 13 3. The Manda Equation (Equation of Center) . 13 4. Apogee and Perigee . 14 5. Solar Declination . 14 6. Equation of Time . 14 7. Practical Applications . 15 Chapter 6 – Lunar M...
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Surya Siddhantha Measured Time Before Modern Clocks — by Yogesh Tiwari

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  Long before digital clocks and atomic  watches, ancient Indian astronomers had already developed a sophisticated method to measure time — down to fractions of a second. The text at the heart of this precision? Surya Siddhanta, a 1,500+ year old Sanskrit astronomical treatise. In this post, we’ll explore how this ancient system measured time using the sun, stars, and mathematics — and why it still deserves our attention today. 🌞 What is Surya Siddhanta? Surya Siddhanta is an ancient Indian text on astronomy and timekeeping. It offers detailed methods to calculate: The positions of planets Sunrise and sunset times Eclipses Sidereal time (stellar time) The Earth’s rotation and inclination Far from being mythological, this is a mathematical astronomy manual, written in verse 🕰️ Timekeeping Before Clocks Surya Siddhanta divides time into the following units: Unit Meaning Truti ~29.6 microseconds Nimesha Blink of an eye (~0.213 seconds) Ks...
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🌞 A Timeless Alternative to Daylight Saving: Surya Siddhantha and the Ujjain Prime Meridian - by Yogesh Tiwari

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🌞 A Timeless Alternative to Daylight Saving: Surya Siddhantha and the Ujjain Prime Meridian Introduction As the world questions the effectiveness and health impacts of Daylight Saving Time (DST), ancient Indian astronomy offers a fascinating, logical alternative rooted in celestial observation: Surya Siddhantha. Developed thousands of years ago, the Surya Siddhantha is a Sanskrit astronomical treatise that laid the foundation for timekeeping in India. It accurately describes solar movements, earth’s tilt, and the role of the sunrise at Lanka (roughly corresponding to Ujjain’s longitude) as a reference for time measurement. Today, we explore how this system—placing Ujjain (India) as the Prime Meridian (0° longitude)—offers a geographically fair, astronomically grounded alternative to artificial adjustments like DST. 🧭 Why Ujjain as the Prime Meridian? Geographic and Astronomical Justification Ujjain (Longitude ~75.8° E) lies close to the ancient city of Lanka (as per Surya Sid...
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