SIDUS

I write software, and I am not a space engineer. I published sidus.tools so a check would be a page you can read: the inputs, the formula, and a number in SI.

As of 4 September 2026 there are 201 tools. You can run a transfer, a link budget, a rocket equation, a cabin atmosphere. They run in the browser. There is no account. The project is independent, with no agency behind it.

The page and the public URL use the same function. On 13 August 2026 a Hohmann transfer from about 200 km LEO to GEO came back as 3931.86 m/s in both places. If that number is wrong on the page, it is wrong on the URL, and you fix it once.

Defaults use ordinary Earth values for teaching (μ⊕ = 3.986004418×10¹⁴ m³/s², equatorial radius 6 378 137 m). The models stay small: two-body, impulsive burns, circular relative motion, an ideal rocket, standard-atmosphere aero. Two-body pages cite Vallado and Curtis. A page can export the calculation into code you can compile. Review it before you trust it.

The catalog is also at https://sidus.tools/api/mcp. You point a client at that URL. Source: github.com/massimodeluisa/sidus-tools.