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Vedic Astronomy & Jyotisha Shastra
वेदाङ्ग ज्योतिषम् • Sage Lagadha (c. 1400–1200 BCE)

Vedanga Jyotisha Calculator & Explorer

Authentic mathematical astronomy of the 5-Year Vedic Yuga (*Pancha-samvatsaramaya Yuga*) based on INSA 1985 Critical Edition by Prof. T.S. Kuppanna Sastry.

यथा शिखा मयूराणां नागानां मणयो यथा ।
तद्वद् वेदाङ्गशास्त्राणां गणितं मूर्ध्नि वर्तते ॥

"Like the crest on the peacock, like the gem atop a serpent's hood, so stands Ganita (astronomy) at the supreme crest of all Vedanga sciences!" — Yajusha Jyotisha 1

1. Five-Year Yuga Explorer (पञ्चसंवत्सरमय युग)

A full Vedic cycle comprises 1830 Savana days, 62 synodic months, 67 sidereal months, and 124 Parvans (fortnights). Select any year or slide through the 124 Parvans below.

Fortnight Navigation (पर्व निर्णय)

Select any Parvan from 1 to 124 across the 5 years
Parvan 1 of 124
Parvan 1 (Magha Shukla) Parvan 31 (1st Adhimasa) Parvan 62 (Mid-Point) Parvan 93 (Vernal Vishuvat) Parvan 124 (2nd Adhimasa)
Current Samvatsara
Samvatsara
Deity: Agni (Year 1)
Sun's Nakshatra (Surya)
Shatabhisha
11/124 Bhamshas
Moon's Nakshatra (Parva-Bhamsa)
Magha
73/124 Bhamshas
Elapsed Savana Days
15 Days
Shukla Paksha
Current Season & Ayana
Shishira Ritu
Uttarayana (Northward)
Equinox / Vishuvat Status
Regular Parvan
Day/Night varying
🌕
Adhimasa (Intercalary Month) Inserted!

2. Aharmana & Vedic Clepsydra (Water Clock) Simulator

Sage Lagadha formulated day-length variation using a water clock (Khadaprastha). Day grows by 1 Palaprastha of water (4/61 Nadika) per day from 12 Muhurtas (Winter Solstice) to 18 Muhurtas (Summer Solstice).

Ghatika Yantra
CLEPSYDRA (WATER BOWL)

Seasonal Day-Length Slider

Day 0 (Solstice)
Day-Length (Ahar-mana)
12h 00m
24 Nadikas / 12 Muhurtas
Night-Length (Ratri-mana)
12h 00m
36 Nadikas / 18 Muhurtas
Water Measure (Palaprasthas)
0 Prasthas
Copper Bowl Discharge
Time in Kalas
241 Kalas
1 Savana Day = 603 Kalas

3. Tri-System Astronomical Comparison

Compare Sage Lagadha's 1400 BCE coordinates with Classical Surya Siddhanta and Modern Drik Ganita, demonstrating the 54° Precession of the Equinoxes.

Astronomical Attribute Vedanga Jyotisha (Sage Lagadha) Surya Siddhanta (Classical) Drik Ganita (Modern Ephemeris)
🌌 Understanding the Precession of Equinoxes (Ayanamsha):

4. Vedanga Jyotisha Shloka Treasury (मूल श्लोकाः)

Core verses from Archajyotisha (Rigveda) and Yajushajyotisha (Yajurveda) with English translation and mathematical commentary by Prof. T.S. Kuppanna Sastry (INSA 1985).