Why we publish our method
The site publishes its method, including the formulas and the library it uses, so that anyone can check the calculations. Publishing the method is a deliberate choice for a site that presents calculations as checkable.
What it is
The method page lists each formula, the ayanamsa values, the library and its licence, and the verification status. The code for the tools is a set of plain scripts that can be read in the browser.
How it is worked out or read
Readers who find an error are asked to report it, and the page is corrected with a note where a result changes. Interpretations are described as traditional, and the method page does not claim more than the calculations support.
Where it appears on this site
The method is on the method page. The verification article explains what is planned.
The astronomy library
The positions of the Sun, Moon and planets on this site are computed with Astronomy Engine, an open-source astronomy library released under the MIT licence. It runs entirely in the reader's browser, and its own documentation describes its methods and its accuracy, which is well within what any chart or panchang requires. Using a published, openly licensed library means that the core astronomy can be checked by anyone, independently of this site.
What the site adds on top
On top of the library, the site's own scripts subtract the chosen ayanamsa, compute the Lagna from local sidereal time, divide the zodiac into signs and nakshatras, apply whole-sign houses, compute the mean node for Rahu and Ketu, find the panchang's five limbs at sunrise and their end times, build the Vimshottari dasha timeline, and test a small set of yoga and dosha rules. Each of these steps is described on the Method page, and the scripts themselves are plain JavaScript that a reader can open in the browser and read.
Why publish the method
A calculator that hides its method asks to be trusted. One that publishes it can be checked. Because Jyotish involves many conventions, such as the ayanamsa, the house system, the node and the sunrise definition, two honest calculators can give different results, and the only way to understand a difference is to know what each one assumes. Publishing the method lets a reader see exactly which choices were made and compare them with another source.
Errors and corrections
No calculator is free of errors. If a reader finds a result that disagrees with a reliable source after the conventions have been matched, the Contact page is the place to report it, with the date, place and settings used. Corrections are noted on the relevant page, so that anyone who used an earlier result can see what changed and why.
The limits of the method
Publishing the method makes the calculations checkable; it does not make the interpretations scientific. The articles on this site present interpretations as traditional readings, name their sources where possible, and avoid claims the calculations cannot support. Keeping that distinction clear is part of the same commitment to openness.