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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<title>About Satvis - 3D Satellite Tracker & Sky View</title>
<link rel="canonical" href="https://satvis.space/about" />
<meta
name="description"
content="How Satvis tracks satellites: CelesTrak GP element sets propagated with SGP4, pass prediction for a ground station you set, and a compass-aimed sky view. Free and open source."
/>
<meta property="og:type" content="article" />
<meta property="og:site_name" content="Satvis" />
<meta property="og:url" content="https://satvis.space/about" />
<meta property="og:title" content="About Satvis - 3D Satellite Tracker & Sky View" />
<meta
property="og:description"
content="How Satvis tracks satellites: CelesTrak element sets propagated with SGP4, pass prediction for a ground station you set, and a compass-aimed sky view."
/>
<meta name="twitter:card" content="summary" />
<link rel="stylesheet" href="/src/css/about.css" />
<script type="module" src="/src/about.ts"></script>
<style>
body {
margin: 0;
background: #0b222d;
}
.about-back {
max-width: 46rem;
margin: 2rem auto 0;
padding: 0 1.25rem;
font-family: sans-serif;
}
.about-back a {
color: #7fd2ea;
}
</style>
</head>
<body>
<div class="about-back"><a href="/">← Open the globe</a></div>
<!-- src/components/AboutDialog.vue lifts this element's innerHTML into the in-app dialog, which is why the back link above sits outside it.
The readme's opening and feature list are a cut of this copy and reuse its sentences word for word, so a wording change starts here. -->
<main id="about-content" class="about">
<h1>Satvis: 3D satellite tracker and pass predictor</h1>
<p class="about-lede">
Satvis is a free, open-source satellite tracker that runs in the browser. It draws more than 16,000 satellites on a 3D globe in real time: Starlink, GPS, weather
satellites, the ISS and many more. Set your location and it predicts when each one passes overhead. The sky view shows the sky from where you stand. Point your phone up to
see the satellites in that direction.
</p>
<h2>See it in action</h2>
<!-- The demo bookmarks (src/config/bookmarks.ts), as their cards show them; bookmarks.test.ts holds the two to one set. src/modules/util/carousel.ts
adds the buttons, here and in the dialog, which opens a demo in place. -->
<section class="demoCarousel" aria-roledescription="carousel" aria-label="Demos">
<svg class="demoCarousel__icons" aria-hidden="true">
<symbol id="demo-icon-orbit" viewBox="0 0 24 24">
<g fill="none" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="2">
<path d="M20.341 6.484A10 10 0 0 1 10.266 21.85m-6.607-4.334A10 10 0 0 1 13.74 2.152" />
<circle cx="12" cy="12" r="3" />
<circle cx="19" cy="5" r="2" />
<circle cx="5" cy="19" r="2" />
</g>
</symbol>
<symbol id="demo-icon-globe" viewBox="0 0 24 24">
<g fill="none" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="2">
<circle cx="12" cy="12" r="10" />
<path d="M12 2a14.5 14.5 0 0 0 0 20a14.5 14.5 0 0 0 0-20M2 12h20" />
</g>
</symbol>
<symbol id="demo-icon-crosshair" viewBox="0 0 24 24">
<g fill="none" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="2">
<circle cx="12" cy="12" r="10" />
<path d="M22 12h-4M6 12H2m10-6V2m0 20v-4" />
</g>
</symbol>
<symbol id="demo-icon-telescope" viewBox="0 0 24 24">
<g fill="none" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="2">
<path d="m10.065 12.493l-6.18 1.318a.934.934 0 0 1-1.108-.702l-.537-2.15a1.07 1.07 0 0 1 .691-1.265l13.504-4.44m-2.875 6.493l4.332-.924M16 21l-3.105-6.21" />
<path
d="M16.485 5.94a2 2 0 0 1 1.455-2.425l1.09-.272a1 1 0 0 1 1.212.727l1.515 6.06a1 1 0 0 1-.727 1.213l-1.09.272a2 2 0 0 1-2.425-1.455zM6.158 8.633l1.114 4.456M8 21l3.105-6.21"
/>
<circle cx="12" cy="13" r="2" />
</g>
</symbol>
</svg>
<ul class="demoCarousel__track">
<li class="demoCarousel__slide" aria-roledescription="slide" aria-label="1 of 3">
<a class="demoCarousel__link" href="/" data-demo="demo-globe">
<img
src="/showcase/globe-card.jpg"
srcset="/showcase/globe-card.jpg 480w, /showcase/globe.webp 3200w"
sizes="(min-width: 46rem) 43.5rem, 100vw"
width="480"
height="300"
alt="The globe with weather satellites labelled around it"
/>
<span class="demoCarousel__name">Weather satellites</span>
<span class="demoCarousel__fact"
><svg aria-hidden="true"><use href="#demo-icon-orbit" /></svg>Weather satellites</span
>
<span class="demoCarousel__fact"
><svg aria-hidden="true"><use href="#demo-icon-globe" /></svg>Globe</span
>
</a>
</li>
<li class="demoCarousel__slide" aria-roledescription="slide" aria-label="2 of 3">
<a
class="demoCarousel__link"
href="/?tags=&sats=ISS+(ZARYA)&track=ISS+(ZARYA)&elements=Point,Label,Orbit,3D+model&layers=VersaTiles"
data-demo="demo-iss"
>
<img
src="/showcase/iss-card.jpg"
srcset="/showcase/iss-card.jpg 480w, /showcase/iss.webp 3200w"
sizes="(min-width: 46rem) 43.5rem, 100vw"
width="480"
height="300"
alt="A 3D model of the ISS above the curve of the Earth, on its orbit line"
loading="lazy"
/>
<span class="demoCarousel__name">Follow the ISS</span>
<span class="demoCarousel__fact"
><svg aria-hidden="true"><use href="#demo-icon-orbit" /></svg>ISS (ZARYA)</span
>
<span class="demoCarousel__fact"
><svg aria-hidden="true"><use href="#demo-icon-crosshair" /></svg>Following it</span
>
</a>
</li>
<li class="demoCarousel__slide" aria-roledescription="slide" aria-label="3 of 3">
<a
class="demoCarousel__link"
href="/?scene=Sky&gs=46.5935,7.9091,Lauterbrunnen&terrain=ReEarth&layers=VersaTiles&stars=DeepStar2K&tags=Active"
data-demo="demo-sky"
>
<img
src="/showcase/sky-card.jpg"
srcset="/showcase/sky-card.jpg 480w, /showcase/sky.webp 3200w"
sizes="(min-width: 46rem) 43.5rem, 100vw"
width="480"
height="300"
alt="Night sky over the Lauterbrunnen valley, with labelled navigation, weather and OneWeb satellites above the cliffs"
loading="lazy"
/>
<span class="demoCarousel__name">Sky over Lauterbrunnen</span>
<span class="demoCarousel__fact"
><svg aria-hidden="true"><use href="#demo-icon-orbit" /></svg>Active satellites</span
>
<span class="demoCarousel__fact"
><svg aria-hidden="true"><use href="#demo-icon-telescope" /></svg>Sky over Lauterbrunnen</span
>
</a>
</li>
</ul>
<!-- Shown by carousel.ts; without a script the track still scrolls. -->
<div class="demoCarousel__controls" hidden>
<button type="button" class="demoCarousel__step demoCarousel__step--prev" aria-label="Previous demo">
<svg viewBox="0 0 24 24" aria-hidden="true">
<path fill="none" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="m15 18l-6-6l6-6" />
</svg>
</button>
<button type="button" class="demoCarousel__step demoCarousel__step--next" aria-label="Next demo">
<svg viewBox="0 0 24 24" aria-hidden="true">
<path fill="none" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="m9 18l6-6l-6-6" />
</svg>
</button>
<span class="demoCarousel__dots" aria-hidden="true"></span>
</div>
</section>
<h2>What it does</h2>
<ul>
<li>Visualize satellites on a 3D globe in real time, propagated in the browser with SGP4 from CelesTrak GP element sets (OMM/TLE)</li>
<li>
Show points, labels, orbits, orbit tracks, ground tracks, sensor cones, 3D models and ground station links per satellite, colored by orbit class (LEO, MEO, GEO, HEO)
</li>
<li>Switch catalog groups on and off (Starlink, GNSS, weather, Earth observation, crewed stations), or search for a single satellite</li>
<li>Select a satellite to see its orbit, its next passes over your locations and its spacecraft details: country, operator, manufacturer, bus, mass and size</li>
<li>Track a satellite: the camera flies to it and follows it along its orbit</li>
<li>Save your location or any point you pick on the map, then list the upcoming passes over it and get a local browser notification before one starts</li>
<li>Find satellites overhead in the ground-level sky view, aimed by dragging or by pointing your phone</li>
<li>See which satellites you could spot: the sky view dims those in Earth's shadow, too far away or in a daylit sky</li>
<li>View the globe in 3D, flattened to 2D or in Columbus view, over a base map, star field and terrain you choose</li>
<li>Add OpenStreetMap buildings to the globe, or Google's photorealistic tiles under the sky view</li>
<li>Start from the demo views, bookmark your own, and share any view as a link: the url carries the satellites, the components, the locations and the map layers</li>
<li>Install it as a Progressive Web App and keep using it offline, from a cached element-set snapshot and base map</li>
<li>Deploy it serverless: static files on a CDN, with an optional Cloudflare Worker serving fresh satellite data</li>
</ul>
<h2>Where the data comes from</h2>
<p>
Element sets come from <a href="https://celestrak.org" rel="noopener">CelesTrak</a> as OMM JSON, the format replacing TLE for new objects, and a
<a href="https://workers.cloudflare.com" rel="noopener">Cloudflare Worker</a> serves them, refreshed several times a day. Positions are propagated from them in the browser
with SGP4, through <a href="https://github.com/shashwatak/satellite-js" rel="noopener">satellite.js</a>. A snapshot of the same element sets ships inside the app, so
everything still works offline. What each satellite is (its country, operator, manufacturer, bus, mass and size) comes from Jonathan McDowell's
<a href="https://planet4589.org/space/gcat/" rel="noopener">GCAT</a>: data from J. McDowell, planet4589.org, under
<a href="https://creativecommons.org/licenses/by/4.0/" rel="noopener">CC BY 4.0</a>.
</p>
<h2>Built with</h2>
<p>
<a href="https://cesiumjs.org" rel="noopener">CesiumJS</a> draws the globe, <a href="https://vuejs.org" rel="noopener">Vue</a> and
<a href="https://ui.nuxt.com" rel="noopener">Nuxt UI</a> the interface, and <a href="https://developers.google.com/web/tools/workbox" rel="noopener">Workbox</a> the service
worker. The icons are <a href="https://lucide.dev" rel="noopener">Lucide</a>'s, under the ISC license and, for those drawn from Feather, the MIT license:
<a href="/licences/lucide.txt">its notice</a>. Everything but the data API is static files on a CDN, so there is no server to run. Created by Florian Mauracher and
maintained on <a href="https://github.com/Flowm/satvis/" rel="noopener">github.com/Flowm/satvis</a> under the MIT license. An
<a href="https://apps.apple.com/us/app/satvis/id1441084766" rel="noopener">iOS app</a> draws the same satellites natively, from the same data, and notifies you before a
pass.
</p>
</main>
</body>
</html>