TKS Ephemeris · प्रयोगशाला · Laboratory
The TKS Ephemeris suite keeps its interactive instruments together under one menu. Every one of them is a live page driven by the same independent engine and the same apparent-position pipeline (Engine A; JPL DE440/DE441 is used only as reference state data) — nothing here is a screenshot, and nothing is invented.
One engine, several definitions of the sidereal offset: true Chitrāpakṣa (Spicā with proper motion, held at 180° by definition), our Lahiri model, Spicā frozen (no PM — isolating the proper-motion term), and zero-epoch systems (KP / Raman / Fagan–Bradley / Yukteshwar style, defined by their zero year and integrated with our own precession chain).
किसी भी ऐतिहासिक (या दावा-कृत) तिथि पर नवग्रह कहाँ थे — निरयन (TKS Chitrāpakṣa) देशान्तर, राशि, नक्षत्र + चरण, वक्री-अवस्था, दैनिक गति, तिथि/पक्ष/योग/वार, राहु-केतु (स्पर्शी node) तथा उस दिन के निकटतम कुरुक्षेत्र-दृश्य ग्रहण; साथ में राशि-चक्र पर नवग्रह का चित्र।
अरुन्धती (Alcor) और वसिष्ठ (Mizar) — पृथक्करण ~11.8′ पर स्थिर, पर अयन-चलन से अभिविन्यास घूमता है — इसलिए «कौन आगे» हजारों वर्षों में पलटता है।
The pañcāṅga of this moment, running: vāra, tithi, nakṣatra, yoga and karaṇa with māsa/pakṣa and ayanāṃśa, together with the nirayana sphuṭa of all nine grahas — Sūrya, Candra, Maṅgala, Budha, Guru, Śukra, Śani and the true Rāhu–Ketu axis.
The Moon does not travel on the ecliptic: its orbit is tilted by i ≈ 5.145° and crosses the ecliptic on the pāta (node) line — Rāhu and Ketu. This lab measures the whole geometry: the node Ω and the inclination from h = r × v, every node crossing and apsis, the latitude of every syzygy, and the eclipse seasons of the year.
The live apparent Sun and the Earth–Sun geometry — the real disc, declination, the equation of time, seasons and saṅkrānti, and the ayanāṃśa.
The live Moon — phase, orbit, nodes, nakṣatra, tithi and rise/set, with the real distance and the geometry that decides an eclipse.
First and last visibility of the planets. Primary rule: the shāstrīya Sūrya-siddhānta Ch.9 lagnāntara-asu test (K = lagnāntara-asu ÷ 60, visible ⟺ K > C) on TKS apparent longitudes.
Rise, set and visibility of every planet, in four stages: the three visibility definitions (geometric · apparent · heliacal), the Mercury & Venus lab, the heliacal calendar and the “why visible?” provenance.
True-scale geocentric view: the Moon at its real km, the real umbra/penumbra/antumbra cones, phase and terminator with your own horizon, and one real lunation.
23.44° axial tilt, the moving terminator, day length from the engine and from 2H₀/15, analemma, seasons and saṃpāta/ayana instants, the real orbit (Kepler I) and a gnomon.
The whole planetary system in one real-scale view, with the planets' apparent sizes, phases and distances from the same engine.
1 · Real data only. Every number on these pages comes from the server engine at that instant (or from a precomputed catalogue built by the same engine) — no placeholder constants, no invented values; where something is not implemented it is labelled planned / offline / reconstruction. 2 · One request per need. A page never loops an HTTP call per sample; loops run server-side (e.g. /v1/tks/month, /v1/tks/sun-year, /v1/tks/moon-day, /v1/tks/transitions). 3 · Cross-checks are shown. Engine value and classical formula are printed side by side (δ vs sin δ = sin ε · sin λ☉, day length vs 2H₀/15, illumination vs ½(1+cos i), catalogue instants vs the API). 4 · Labelled drawings. Anything enlarged for visibility is marked as such (×N, “drawing only”); true-scale quantities stay true. 5 · Labels never lie and never overlap. Text is placed inside a safe band with collision avoidance, so a value cannot be read under the wrong mark.
Solar & lunar eclipse scans over any year range, with magnitudes, saros and the Besselian geometry.
Tithi, vāra, nakṣatra, yoga, karaṇa, rāśi and saṅkrānti with their derivations, plus a full month view.
The sky dome with the named stars (HIP → European → Vaidika names), the nakṣatra belt and the planets above your horizon.