Jyotisha
Jyotisha is one of the six Vedangas, dealing with astrology, astronomy, and the calculation of auspicious times for Vedic rituals.
- Jyotisha is the Vedanga of astronomy and astrology — the science of light, time, and celestial cycles.
- It is called the 'eyes of the Vedas' — determining the correct timing for Vedic rituals.
- The Vedanga Jyotisha is the oldest surviving Indian astronomical text, dating to around 1400–1200 BCE.
- Originally focused on the lunar calendar and timing of yajnas — tracking nakshatras (lunar mansions).
- Jyotisha evolved into three branches: Ganita (mathematics/astronomy), Hora (natal astrology), and Samhita (mundane astrology).
- The 27 (or 28) Nakshatras — lunar mansions — are a central contribution of Vedic astronomy.
- Later texts like Aryabhata's Aryabhatiya (499 CE) and Varahamihira's Brihat Samhita elevated Jyotisha into advanced astronomy.
- Indian mathematicians using Jyotisha developed zero, the decimal system, trigonometry, and algebra.
Structural Organization
Example: Vedanga Jyotisha — 36 verses on Vedic calendar reckoning
Key Topics
Key Figures
Key Texts & Works
Featured Shlokas
The Five-Year Yuga Cycle (Samvatsara)
Vedanga Jyotisha (Yajurveda recension) · Chapter 1 · Verse 1
पञ्चसंवत्सरमयं युगाध्यक्षं प्रजापतिम्। दिनर्क्षौ दिनचन्द्रं च प्रपद्ये जगतां पतिम्॥
pañcasaṃvatsaramayaṃ yugādhyakṣaṃ prajāpatim | dinarakṣau dinacandraṃ ca prapadye jagatāṃ patim ||
I take refuge in Prajāpati (the Lord of Creatures), who presides over the five-year Yuga cycle — along with the daily nakṣatra (star), the daily sun, and the daily moon. The Vedic calendar runs on a 5-year Yuga cycle of 1,830 days.
Without Jyotisha the Veda Cannot Be Known
Vedanga Jyotisha (Yajurveda recension) · Chapter 1 · Verse 3
वेदस्य निखिलस्यार्थं ज्योतिषं श्रुतिचक्षुषः। तदविज्ञाय वेदस्तु न ज्ञातः स्यात् कदाचन॥
vedasya nikhilasya arthaṃ jyotiṣaṃ śruticakṣuṣaḥ | tad avijñāya vedas tu na jñātaḥ syāt kadācana ||
Jyotiṣa is the eye of the Vedas — it illuminates the meaning of the entire Veda. Without knowing Jyotiṣa, the Veda can never truly be known, because the timing of all rituals depends on correct astronomical knowledge.
Jyotisha as the Crown of All Vedangas
Vedanga Jyotisha (Yajurveda recension) · Chapter 1 · Verse 4
यथा शिखा मयूराणां नागानां मणयो यथा। तद्वद् वेदाङ्गशास्त्राणां ज्योतिषं मूर्ध्नि संस्थितम्॥
yathā śikhā mayūrāṇāṃ nāgānāṃ maṇayo yathā | tadvad vedāṅgaśāstrāṇāṃ jyotiṣaṃ mūrdhni saṃsthitam ||
As the crest-feather stands atop a peacock, and as a gem sits atop the hood of a cobra — so Jyotiṣa (Astronomy/Vedic Calendar Science) stands at the crown of all the Vedāṅga sciences.
The Five Years of the Yuga Named
Vedanga Jyotisha (Yajurveda recension) · Chapter 1 · Verse 5
संवत्सरः परिवत्सर इडावत्सरः। अनुवत्सरः इद्वत्सरश्च — इति पञ्च संवत्सराः। एतेषां समाहारो युगम् उच्यते॥
saṃvatsaraḥ parivatsara iḍāvatsaraḥ | anuvatsaraḥ idvatsaraś ca — iti pañca saṃvatsarāḥ | eteṣāṃ samāhāro yugam ucyate ||
The five years of the Vedic Yuga are: (1) Saṃvatsara, (2) Parivatsara, (3) Iḍāvatsara, (4) Anuvatsara, (5) Idvatsara. Together these five years constitute one Yuga — the fundamental cycle of the Vedic calendar.