Who writes this site

The author

The site is written and developed by Emmanuel Magon. The calculator is not a wrapper around someone else's service: the computation engine was written for this site, from the Besselian elements published by NASA/GSFC, and cross-checked against the INPOP19A ephemerides of the IMCCE (Paris Observatory).

How the figures are checked

In August 2026, a missing term in the hour angle — the Earth's rotation during ΔT — was shifting the whole computation 0.30° west, some thirty kilometres. It was found by recomputing the central line from the Besselian elements and comparing it with the points published by NASA, then corrected; every table on the site was regenerated straight after.

That is what a verifiable computation makes possible, and it is why the method and the sources are written out on every calculator page rather than summed up in a single line.

How the site makes money

Solunareclipse does not sell glasses. The purchase links point to Absolute Eclipse, a reseller of ISO 12312-2 certified glasses, and a commission is paid if you buy — at no change to the price.

Reusing the calculator

The calculator can be embedded freely on another site — astronomy club, planetarium, tourist office, observation page. The code is ready to copy; the only condition is that you keep the attribution link.

Get in touch

For a question about the computation, a mistake you spotted, a reuse request or a correction: write, and you will get an answer.