COSMOTOOLBOX / FIELD DESK

Find the right tool
for the sky above.

Twenty precise astronomy tools for planning an observing session, checking the sky, or working through the physics.

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Common observing tasks

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Plan an observing sessionStart with the sky and your equipment Check the Moon phaseCurrent lunar phase and age Track the ISSFollow its orbit in real time Set up a telescopeCalculate magnification and optics
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Astronomical toolset

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7 Tools

Observation 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
Explore Observation Tools → 5 Tools

Calculation & Conversion

Convert dates, distances, and planetary numbers in seconds.

  • Planet Weight
  • Julian Date
  • Distance Converter
  • Orbital Period
  • + 1 more tool
Explore Calculation Tools → 8 Tools

Physics Tools

Black holes, stellar furnaces, and the expanding universe — real astrophysics.

  • Black Hole Radius
  • Escape Velocity
  • Star Temperature
  • Redshift & Hubble
  • + 4 more tools
Explore Physics Tools →

Latest Field Notes

Enter the Journal
Cosmic microwave background radiation map Physics

The Big Bang Theory

The origins of everything: space, time, and the CMB.

Cosmology · 8 min read Galaxy cluster revealing dark matter through gravitational lensing Physics

Dark Matter & Energy

The invisible 95% of the universe explained.

Cosmology · 9 min read James Webb Space Telescope against a distant galaxy field Technology

The JWST: A New Eye

How the James Webb Space Telescope reshapes astronomy.

Observatories · 10 min read Stellar nursery nebula Astronomy

Life of Stars

From nebula to supernova: stellar evolution.

Stellar science · 7 min read Martian terrain explored by a rover Exploration

Mars Exploration

Searching for signs of past life on the Red Planet.

Solar system · 8 min read Voyager spacecraft entering interstellar space Exploration

The Voyager Mission

Humanity's farthest reach into interstellar space.

Missions · 9 min read

Why Choose CosmoToolbox?

Real Scientific Formulas

Every calculator runs on verified equations — from Wien's Law to the Schwarzschild radius — using constants published by NASA and the IAU.

Instant In-Browser Results

All tools compute locally on your device with zero wait, zero installation, and zero server round-trips.

Learn as You Calculate

Each tool includes the formula, a step-by-step user guide, and FAQs, so every answer doubles as a mini lesson.

Privacy First

No accounts, no tracking, no data collection. Your calculations never leave your browser.

Start Exploring the Universe

Whether you're planning tonight's observing session or puzzling over an astrophysics problem, CosmoToolbox has the tool for the job.

Browse All Tools Read the Journal

Professional Astronomical Data at Your Fingertips

CosmoToolbox is a comprehensive suite of digital tools designed for the modern astronomer. From calculating Schwarzschild radii to tracking the ISS in real-time, our platform provides accurate, verifiable data for both amateur and professional use.

Educational Commitment

We believe that every calculation should be a learning opportunity. That's why every tool in our suite is accompanied by a detailed scientific explanation, user guide, and FAQ section, ensuring that users understand the physics and mathematics behind the cosmos.