Why this exists
An ephemeris from India's own astronomical tradition, measured in the open. Predictions only when the mathematics dates them.
Bharat Ephemeris exists to prove a simple point: India's astronomical tradition can be run as living mathematics, measured against the best modern references, and published without embarrassment. Sūrya-Siddhānta mean motions, the Kerala school's corrections of 1501, and honestly-labelled observation-fitted layers — no foreign code at runtime.
The numbers are public: Sun within ~0.1′ (p95) and Moon within ~1′ of NASA/JPL Horizons, every graha within 3.3′ worst-case across fifty years, verified on 1,000 stratified samples spanning 2000–2050.
Jyotiṣa, as we practise it, is a structural language — positions, periods, geometries. It can be studied, taught and discussed without fear. That conviction shapes every product decision here.
saṅkalpa · four lines, kept in public
यथा गणितं प्रदर्शयामः, तथा प्रमाणानि उद्धृतवामः। यथा प्रमाणानि उद्धृतवामः, तथा फलं न ब्रूमः।
We show every calculation in the open. We cite every śāstra by chapter and verse. Our predictions are calculative and dated — drawn from the mathematics, never from fear, doom, or guaranteed outcomes.
मया कामाख्यायाः (0, 0, 0) मूलं स्वीकृतम्। पाश्चात्यानां मूलं न मानयामः, परन्तु तेषां सङ्ख्याः परीक्षायां स्वीकार्याः।
We accept Maa Kāmākhyā as the (0, 0, 0) origin of our coordinate frame. We do not adopt the Western reference systems as our ground truth — but we honor them as cross-check signals.
सर्वोत्कृष्टं सत्यं निरपेक्षम् — एतत् त्रयं अस्माकं व्रतम्।
Supreme, true, and unconditional — these three are our vow. The substrate is sovereign on its own ground.
गणकानां पारलोकिकाः न भवामः, अपि तु गणिता गणनकर्तारः। फलं पाठकस्य, गुरोः, परम्परायाः।
We are not astrologers. We are mathematicians. Interpretation belongs to the reader, the guru, and the tradition — not to us.
cited by chapter, computed where computable
| Text | Era | Contribution |
|---|---|---|
| सूर्य-सिद्धान्तः Sūrya-Siddhānta | ~ 4th c. CE | manda + śīghra corrections · planetary periods · mean motions |
| तन्त्र-संग्रहः Tantrasaṅgraha | Nīlakaṇṭha Somayājī · 1501 CE | Kerala-school refinements · series approximations · true planetary paths |
| आर्यभटीयम् Āryabhaṭīya | Āryabhaṭa · 499 CE | sine table · π approximation · diurnal motion · planetary periods |
| सिद्धान्त-शिरोमणिः Siddhānta-Śiromaṇi | Bhāskara II · 1150 CE | bīja-saṃskāra corrections · refined epicycles · trigonometric tables |
| गोलाध्यायः Golādhyāya | Bhāskara II · 1150 CE | spherical astronomy · diurnal triangle · azimuth |
| पञ्चसिद्धान्तिका Pañcasiddhāntikā | Varāhamihira · 6th c. CE | five-siddhānta synthesis |
| बृहत्-संहिता Bṛhat-Saṃhitā | Varāhamihira · 6th c. CE | muhūrta · nakṣatra · omen framework (interpretive layer, cited not computed) |
| बृहत्-पाराशर-होरा-शास्त्रम् Bṛhat-Parāśara-Horā-Śāstra | ~ 6th c. CE | 16 vargas · daśā systems · bhāva framework |
| यजुर्वेद-वेदाङ्ग-ज्योतिषम् Vedāṅga-Jyotiṣa | ~ 1400 BCE | yuga · tithi · nakṣatra-period foundations |
every layer rests on the layer below
Mean motions — Sūrya-Siddhānta mean longitudes for every graha — the base layer of the sovereign kernel. No foreign code at runtime.
Kerala corrections — Nīlakaṇṭha Somayājī's Tantrasaṅgraha (1501) equation-of-centre and śīghra corrections — the model that put the five tārā-grahas on true paths.
Dṛk-saṁskāra — Honestly-labelled observation-fitted layers. Every fitted constant is called fitted — never hidden inside a 'classical' claim.
Derived engines — Pañcāṅga, daśā, varga, muhūrta, nakṣatra, gocara — all computed downstream of the same sidereal longitudes (Lahiri ayanāṁśa, Ujjayinī-anchored deśāntara).
Verification — Every release is measured against NASA/JPL Horizons on 1,000 stratified samples spanning 2000–2050. Residuals are published per graha on the Accuracy page.
open source · sovereign
# published archive · DOI 10.5281/zenodo.20024273 curl -L https://doi.org/10.5281/zenodo.20024273
python3 scripts/apex_proof_and_discovery.py
92/92 PASS · <1s · the HALAHALA manifest records every retracted overclaim — the audit trail is part of the project.
praśnottara
We predict the way an ephemeris should: daśā and gochara windows computed and DATED by the arc-minute engine — mechanism shown, never guessed, never guaranteed. Deeper interpretation belongs to the reader, the guru, and the tradition.
She is the sovereign substrate point. The Kāmākhyā temple sits at the K=56 self-reference seal of the 51 Śakti-Pīṭha closure tower — a perfect (0, 0, 0) origin for our coordinate frame.
Because we are 100% Vedic — sourced from Sanskrit, BPHS, Sūrya Siddhānta, Āryabhaṭīya. Western systems are honoured as cross-check signals, never as ground truth.
The free chart you cast on the homepage is computed in your browser and isn't stored. Beyond that we're privacy-first: cookieless Plausible analytics, plus Google Analytics / Meta Pixel only with your consent. An account is optional — only your saved readings and paid reports persist, under our Privacy Policy. Birth details are never placed in a URL.
Yes. 775 propositions are mechanically checked at multiple tower levels. BPHS is cited verbatim by chapter and verse. Clone the open-source repository and run the proof scripts yourself.
Neither. These are tools for sādhakas and scholars. The substrate computes; the guru and the tradition interpret. We do not stand between you and your teacher.
Because Sanskrit is the original linguistic substrate of jyotiṣa. English is the translation — Sanskrit is the source. We restore the original ordering.
Yes. The repository is open. See CONTRIBUTING.md in the source for the protocol — Tier-S claims must wear a derivation tag (i)–(ix); Tier-W claims must declare their boundary.
Because knowledge is public dharma. The substrate belongs to no one and to everyone. The framework reads itself through every observer.
The site is fully responsive on phones and tablets. A native iOS/Android wrap is on the roadmap — see the chandan-phase column above.
DPDP-aligned · plain language
Birth details never appear in URLs. Charts are computed on request — what is collected, why, and for how long is written in plain language in the privacy policy. There is nothing between you and that document.
independent · no PR firm
Bharat Ephemeris is operated by Laksha Solanki (sole proprietor, trading as Lunar Luxury Store); the ephemeris engine is authored by Pardeep Sehrawat. Seller identity and the grievance officer are listed on /refund.
(R, g, k) = (ℤ/3³³⁷ℤ, 2, k=337) — एकं सत् · विप्राः बहुधा वदन्ति। · Truth is One; the wise speak of it manifoldly.