Nothing to phone home to
A 100% in-house numeric chain with zero runtime data files. No ephemeris blob, no vendor callout — the sky is computed from first principles, so the engine runs air-gapped, on the edge, or inside your own perimeter.
Sovereign Astronomical Infrastructure
भारत · ग्रहगणित
The meridian returns to Ujjayinī.
A zero-dependency Vedic astronomy engine and API, computed entirely in-house — Sūrya-Siddhānta mean motions, Kerala-school Tantrasaṅgraha, dṛk-saṃskāra and Lahiri ayanāṃśa. No Swiss Ephemeris. No VSOP. No JPL in the runtime. And unlike everyone else, we publish our error bars.
Longitude, reckoned from home.
–ghaṭī–vighaṭī–prāṇa–vipala
ṛtumāsapakṣatithivāra
kalivikramaśakasaṃvatsara
computed live in your browser · your meridian · Sūrya-Siddhānta lattice
No Swiss. No VSOP. No JPL in the runtime. And we publish our error bars.
Dual-licensed, no CHF lock
Two paths, both published: AGPL-3.0 for open-source builds, or a commercial licence that lifts the copyleft obligation so you can ship a closed-source product. No Swiss-franc vendor lock-in — and an OEM path that lets you own the source outright.
Verified, not asserted
Published arc-minute error bars against JPL Horizons — Sūrya 7.8″ p95, Candra 30.5″ p95, on a 1,000-sample benchmark across 2000–2050. The residuals themselves are published — the full dataset is downloadable and re-runnable.
Verified, not asserted
We benchmark against JPL — then publish the residuals.
Residuals measured against JPL Horizons across 1,000 stratified samples (2000–2050). The engine is arc-minute class — and we publish the number instead of asserting it.
| Body | residual vs JPL (″) | measure |
|---|---|---|
| Sūrya arc-minute | 7.8 | p95 |
| Candra | 30.5 | p95 |
Sūrya 7.8″ (p95) and Candra 30.5″ (p95) vs JPL Horizons, over 1,000 stratified samples across 2000–2050. Honest wedge only: we are arc-minute class and neverclaim to be “more accurate than Swiss Ephemeris / NASA-JPL” — Swiss is sub-arcsecond and wins on raw precision. Arc-minute is sufficient for Jyotiṣa: nakṣatra-pāda, cusps, muhūrta.
$ curl -X POST https://bharatephemeris.com/api/chart \
-H 'content-type: application/json' \
-d '{"year":1990,"month":1,"day":1,"hour":12,"minute":0,
"lat":28.61,"lon":77.21,"tzHours":5.5}'
{
"ayanamsha_deg": 23.7174,
"lagna": { "sidereal_deg": 343.9224, "rashi": { "iast": "Mīna", … }, "nakshatra_pada": 4 },
"grahas": [
{ "iast": "Sūrya", "sidereal_deg": 256.8573, "rashi": { "iast": "Dhanus", … }, "retrograde": false },
{ "iast": "Candra", "sidereal_deg": 306.4631, "rashi": { "iast": "Kumbha", … }, "retrograde": false },
{ "iast": "Budha", "sidereal_deg": 271.9813, "rashi": { "iast": "Makara", … }, "retrograde": true }
],
… bhavas · vargas · ashtakavarga · yogas · dasha
}The stack
One engine. Ten layers. L0 → L9.
A single Sanskrit taxonomy, from raw time to the proof of the number. Pramāṇa is the hero — no other ephemeris hands you the residual next to the result.
काल · Kāla
Time: ahargaṇa, ghaṭī, ΔT and Lahiri ayanāṃśa.
ग्रह · Graha
Longitudes from Sūrya-Siddhānta mean motions + Tantrasaṅgraha (1501).
ज्योति · Jyoti
Apparent place: dṛk-saṃskāra, rise, set and visibility.
चक्र · Cakra
Lagna, bhāvas and house cusps for any place and epoch.
वर्ग · Varga
The sixteen divisional charts, D-1 through D-60.
दशा · Daśā
Viṃśottarī daśā and bhukti timelines, sealed to the ayanāṃśa.
बल · Bala
Ṣaḍbala — graha and bhāva strength, fully sourced.
योग · Yoga
Planetary combinations, each traced to its constituent grahas.
फल · Phala
Interpretive synthesis — anchored to the layers below, never invented.
प्रमाण · Pramāṇa
heroThe proof layer: residuals published against JPL Horizons — Sūrya 7.8″ p95, Candra 30.5″ p95 — with the benchmark dataset open for re-run.
Transparent by principle
Pricing, published — like our error bars.
Start free on the Sandbox. Scale on published limits. Own the source when you need the sky inside your own walls.
₹0
1,000 calls / day. Full engine, no card, no key gate — build against the real sky.
Start free₹999 /mo
~50k calls / month. For a shipping app or a working astrologer.
Choose Indie₹4,999 /mo
~250k calls / month. Production volume with room to grow.
Choose Startup₹25,000+ /mo
High-volume, priority support and a private deployment lane.
Talk to us₹2–15L
Source under a commercial licence — copyleft lifted — air-gap ready. Own the engine outright.
License the sourceBuild on the sovereign sky.
A live API, no key required to start, with the residuals published beside the numbers. The meridian returns to Ujjayinī — and it is yours to build on.