Astrunqia

Know what you calculate.

Astrunqia is a free English-language collection of 30 calculators for astronomy. No account is required.

Definitions and scope

Distances use the exact au and speed of light, a Julian light-year and the geometric parsec. Photometry uses consistent bands, with extinction only when entered. Newtonian orbital tools assume an isolated dominant central mass. Stellar luminosity is a spherical effective-blackbody model; spectral Doppler is pure radial special relativity and must not be used as cosmological recession speed. Hubble distance is restricted to small redshift (up to 0.1) and remains approximate. Telescope tools are ideal geometric or diffraction estimates, excluding seeing, optical defects and refraction. Sky coordinates use degrees and a shared epoch. No live planetary positions, Moon phases, sunrise times or event predictions are claimed. Constants are declared in calculators.js, including c, au, G, solar scales, Planck constant and Stefan–Boltzmann constant. General results display up to 12 significant digits; this is not measurement accuracy.

Input and precision limits

Each input has a supported range. Inputs are checked by the calculation engine as well as browser controls. General numeric computations use JavaScript floating-point arithmetic, typically displayed to 12 significant digits. Very large, nonfinite and invalid-domain results are rejected. Display rounding is not a claim of measurement accuracy. The interface identifies undefined results or non-unique solutions instead of inventing a finite answer.

Formulas and examples

Choose any calculator to see its formula, assumptions and an example. Use a period as the decimal separator, without thousands separators.

Reference definitions

Open source and validation

The implementation and automated checks are included in the source package. Created for this project with AI assistance. No external calculation service, executable expression parser or third-party numeric library is bundled. See the source guide and MIT License.

Appropriate use

These are educational and general-purpose tools. Independently verify any result needed for a safety-critical, regulatory, contractual or scientific measurement decision. The tools do not model uncertainty, propagate measurement error or certify calculations.