Type your town — Burdwan, Kolkata, Katihar, anywhere — pick a time in GMT or LMT, and your sky opens: constellations in colour, the Sun, the Moon, the planets, and the horizons that frame them. Then the sextant, the corrections, the PZX triangle, and star sights worked to a fix.
Every figure below is produced by the platform’s own engine.
The full laboratories add the 57 navigational stars, Polaris, the celestial sphere and the PZX triangle.
Start freeReal identifiers, as they appear inside the platform.
| Lab | Title |
|---|---|
| ES-01 | Rotating Earth and coordinate systems |
| ES-06 | Celestial sphere and coordinate frames |
| ES-02 | Solar, apparent and mean solar day |
| ES-03 | Sidereal day and sidereal time |
| ES-04 | Lunar day, retardation, tides — the Earth–Moon–Sun machine |
| ES-08 | PZX — the navigation triangle made physical |
| OP-09 | Sextant optics and index error |
| OP-10 | The altitude-correction laboratory |
| ES-05 | The wandering stars — planets and the almanac |
| ES-07 | The fifty-seven — navigational stars, SHA, and Polaris |
| OP-15 | Star sights to a fix — the harvest |
| OP-12 | Compass error — azimuth and amplitude |
| OP-13 | The sums — latitude and longitude, step by step |
A cadet or a serving officer starts free and is inside a laboratory in a minute. A college talks to us first, because enrolment and faculty tools need setting up properly.