About
No black box.
Mission control for the sky above you — built so that every number on this site can be traced back to a source and a formula.
Launch schedule
From Launch Library 2, the open database maintained by The Space Devs. It is fetched at build time and baked into the pages, because the API sends no CORS header and a browser cannot call it directly. Countdowns are then computed against your own clock, so they stay correct as long as your device clock is.
ISS position
Live from wheretheiss.at, refreshed every few seconds while you keep the page open.
Moon, planets, day–night line
Computed in your browser by astronomy-engine (MIT licence). Nothing about your location is sent to us — the calculation happens on your device.
Map
Land outlines from Natural Earth (public domain), projected equirectangularly. The night region is derived from the instantaneous subsolar point, so it drifts west through the day exactly as it should.
We do not ask you to sign up, and we do not store your coordinates. If you tap “use my position”, the browser asks you; the answer stays in your own browser's local storage and is used only for the altitude calculation.
There is no analytics script on this page — nothing client-side, no cookie, no third-party request. The host does keep ordinary server-side access logs (IP, path, user agent, referrer), which is true of any web server and is what we use when we quote traffic numbers. We would rather say that plainly than install a tracker and pretend otherwise.
Contact
萌石科技（北京）有限公司
京ICP备17060859号
What this is, and what it is notscope, stated plainly
It is
One screen for the question “what is worth looking at tonight”: the next launch, where the station is right now, the moon, the planets that clear the horizon, and the passes you could actually see — for 60 cities and for your own coordinates, computed from public data at build time.
It is not
A satellite catalogue. We track three objects — the ISS, Tiangong and Hubble — because those are the ones a person can plausibly see with their own eyes. If you need 30,000 objects, debris or brightness magnitudes, use Heavens-Above, N2YO or azmth; they are better at it and have been for years.
Self-check historythe gates, published
Last run 2026-10-29 08:14 UTC — green. The gates check internal links, unique titles and descriptions, that the key numbers are in the HTML without JavaScript, that the live site equals the build, that the share cards are complete, and that each gate fails when the site is deliberately broken.
Measured trafficour own numbers, published
Measured 2026-10-29 07:56 UTC over the last 1 days, from 3 access-log file(s). Reads are GET/HEAD after user-agent bot exclusion and after removing our own IPs (of 9,601 raw requests in this window); deploys are PUTs and are separated out so they cannot be mistaken for traffic.
Of those, 5 distinct sessions (0 of which opened more than one page). One page plus its assets is what a link-preview or scanner fetcher looks like; a person usually clicks something.
We do not run an analytics script. These come from the host's ordinary access logs, which every web server keeps. If the numbers are unflattering, they are still the numbers.
Start with the console
One screen: launch countdown, station position, moon and planets.