Astronomy tools, built the way they should be: carefully.
CosmoToolbox is an independent astronomy toolbox, published at amberix.vip. We exist for people who want more than a black-box answer — every calculator states its formula, its constants, and its limits, and every result is computed on your own device. Our approach is deliberately plain: no accounts, no subscriptions, no server round-trips.
Every tool on the site follows the same structure — the formula behind the calculation, the constants it relies on with named sources such as NASA and the IAU, a step-by-step guide, and an FAQ that leaves room for you to check the work yourself. We do not sell products. We do not accept paid placement in the tool directory or in the journal. Our goal is to help you understand how each number is produced, what it assumes, and where it fits in the broader sky.
The collection ranges from the fundamentals that defined the discipline — Kepler's laws, Wien's law, the Schwarzschild radius — to live resources such as the real-time ISS tracker and the current Moon phase. We treat every tool as a complete subject, worthy of its own page, its own explanation, and its own reading experience.
What we cover
View all 20 toolsObservation Tools
Plan a night under the stars, from live ISS positions to telescope optics.
- ISS Tracker
- Moon Phase
- Telescope Magnification
- Sidereal Time
- + 3 more tools
Calculation & Conversion
Convert dates, distances, and planetary numbers in seconds.
- Planet Weight
- Julian Date
- Distance Converter
- Orbital Period
- + 1 more tool
Physics Tools
Black holes, stellar furnaces, and the expanding universe — real astrophysics.
- Black Hole Radius
- Escape Velocity
- Star Temperature
- Redshift & Hubble
- + 4 more tools
Field notes for the long view
Ten in-depth notes — from the Big Bang and dark matter to Mars rovers and Voyager — give each story the pace it deserves.
Our belief
A good tool does not simply hand you a number — it gives you the vocabulary to question one. That is why our pages pair every calculation with its method and its limits, and why the journal combines practical guidance with the history and physics behind the tools. We would rather every visit leave you more curious than more certain.
How to use this site
Start with the homepage: search for a task — "moon phase", "ISS", "redshift" — or browse the three categories above. Every tool page shows the formula before the result, so check our figures against the sources we cite; the most useful numbers are the ones you verify yourself. Follow the Journal to watch a story develop over time. If something looks wrong, tell us through the contact page; and if you want to know how your data is handled, read our Privacy Policy.
How we handle accuracy, sources, and corrections
Read our editorial policy for the standards that guide new articles, calculator explanations, and reported corrections.