Deep-sky night planning · computed in your browser
Tonight’s sky, planned.
The best deep-sky targets of the night — ranked by real visibility under your own skyline, the moon's phase and your sky brightness, and plotted on a live polar sky map. Your sites, rigs and horizons, all in one place.
runs entirely in this tab · no server · no account · works offline
Explore
The planner, the features, the desktop app — pick where you want to go.
🌙 The planner
Open the web app right now — runs in this tab, no install.
Open the planner →⭐ Features
Tonight's picks, the polar sky map, horizon panoramas and more.
See the features →⬇ Download
NightSeam for Windows — the desktop app with the full Image Catalog, plus the changelog.
Get the desktop app →📖 About
What it is, how it works, where the numbers come from, and the credits.
Read about the project →