Open Source Educational Resource

Panchang

The Complete Guide to Indian Calendar Systems

A comprehensive 4-book series covering the Indian Panchang from absolute beginner to PhD-level researcher. Learn about Tithi, Nakshatra, Yoga, Karana, and the astronomical foundations of one of the world's oldest calendar systems.

Books

Associate

Arjun's Cosmic Calendar

Picture-book style for complete beginners

Follow 10-year-old Arjun and his Dadi as they explore the Moon, Sun, and stars. Learn the foundations of Panchang through stories and simple explanations.

  • Moon phases (Amavasya & Poornima)
  • 12 Rashis & 27 Nakshatras
  • Kumbh Mela & Shani Sade Saati science
  • Stellarium basics for sky observation
9 chapters · 15+ diagrams →
Bachelor

Mastering the Calendar

Intermediate technical depth

Deep dive into calculations, formulas, and applications. Learn to compute Tithis, understand Ayanamsha, and use professional Panchang software.

  • Tropical vs Sidereal year
  • Tithi, Yoga, Karana calculations
  • Festival calendar rules
  • Muhurta (electional astrology)
4 parts · 9 chapters · Python code →
Master

Advanced Calculations & History

Advanced academic treatment

Explore 5,000 years of Indian astronomy. Study Surya Siddhanta algorithms, Ayanamsha debates, and research methodology for calendar studies.

  • Vedanga Jyotisha to modern era
  • Surya Siddhanta calculation methods
  • Ayanamsha systems comparison
  • Ephemeris reading & interpolation
5 parts · 11 chapters · Research methods →
PhD

A Forensic Analysis

Formal research monograph

Evidence-based analysis of Indian calendar systems with statistical validation, computational frameworks, and publication-ready research format.

  • Formal mathematical definitions
  • Swiss Ephemeris integration
  • Statistical analysis & validation
  • SQL queries & Python implementations
10 sections · Appendices · Citations →
Reference

Software Tools Guide

Complete software reference

Comprehensive guide to all Panchang software: Stellarium, JHora, DrikPanchang, programming libraries, and mobile apps.

  • Stellarium setup & shortcuts
  • Jyotish App (JHora) configuration
  • Python: Swiss Ephemeris, Skyfield
  • Mobile apps comparison
8 sections · All platforms →
Index

Master Index & Reading Guide

Series navigation & cross-references

Find any topic across all books. Includes reading paths for different goals, glossary quick reference, and cross-reference maps.

  • Topic cross-reference table
  • 5 reading paths for different goals
  • Glossary quick reference
  • Skill-level recommendations
Complete navigation →

Topics Covered

Astronomical Foundations

Calendar Systems

Panchang Components

Special Topics

Software & Tools

Research & History

Reading Paths

Complete Beginner → Expert

1 Book 1: Associate (foundations)
2 Book 2: Bachelor (calculations)
3 Book 3: Master (history & depth)
4 Book 4: PhD (research)
Time: ~40 hours total

Quick Overview

1 Book 1: Associate (basics)
2 Software Guide (tools)
Time: ~3-4 hours

Practical Application

1 Book 1: Associate (foundations)
2 Book 2: Bachelor Part III (applications)
3 Software Guide (implementation)
Time: ~10 hours

Research Focus

1 Book 3: Master (foundations)
2 Book 4: PhD (research)
3 Software Guide (programming)
Time: ~30+ hours