Features

A planner that knows the night sky

Everything is computed locally in your browser — the catalog, the sky and your data never leave the page.

Ranked targets with clear-window times, moon-aware scoring and a Bortle-adjusted view of what the night can deliver.

Zoom, pan and scrub the all-sky chart with the sun, moon and 12,000 objects — a rectangular window that shows you more.

Every target scored for real visibility — altitude, your painted horizon, the moon's phase, your filters and your sky brightness.

Import a 360° panorama, paint the trees and houses, and see which targets your skyline actually lets you see.

Your observing locations and equipment — per-site timezones, DST-aware, backed up as JSON.

The entire catalog (Messier + OpenNGC) ships with the page — works offline, nothing uploaded, no account.

Current conditions and a 4-day forecast for your observing site — loaded on demand, nothing fetched until you click.

Wheel-zoom opens a rectangular window over the all-sky chart — more sky than a circular magnifier, with drag-pan and double-click reset.