AstroTool: Night Sky Planner

5+ hours of true dark sky tonight. 284 deep sky objects ranked by altitude & moon separation. Built for astrophotographers who plan smarter.

AstroTool is a planning and logging tool built for amateur astronomers and astrophotographers. Everything runs on-device — no account, no subscription, no internet required for calculations. NIGHT PLANNER Pick any date and get everything you need for a session. Moon phase with illumination percentage and a plain-English imaging impact rating, full twilight schedule (civil, nautical, and astronomical dusk and dawn), total darkness window, and a ranked list of tonight's best deep sky targets — automatically scored by peak altitude and moon separation. DEEP SKY CATALOG Browse 284 unique objects spanning the Messier, Caldwell, NGC, and IC catalogs. Filter by catalog, object type, or capture status. Sort by magnitude, altitude, or catalog order. Every object shows rise, transit, and set times for tonight, and a hero image sourced from NASA, ESA, Hubble, and community astrophotographers. SESSION LOGGER Log every session with Bortle scale, seeing and transparency scores, location, and notes. Record individual targets with exposure length, sub count, gain, filter, equipment, and a star rating. Your complete imaging history — stored entirely on your device. EQUIPMENT LIBRARY Build a library of your telescopes, cameras, mounts, eyepieces, and filters. Attach equipment to any session for a full record of what you used and when. TARGET SCHEDULER Add catalog objects to a nightly capture plan with start and end times, planned exposure, sub count, gain, and filter. Check targets off as you go and convert planned captures directly into log entries. SESSION CHECKLISTS Two built-in checklists keep you organised from setup to wrap-up — a customisable session plan with 33 presets across 7 categories, and a 44-item pre-session photo checklist covering everything from polar alignment to calibration frames. SKY EVENTS A 120-day rolling calendar of moon phase events, all 10 major annual meteor showers (Perseids, Geminids, Leonids, and more), and equinoxes and solstices — with countdowns so you never miss a dark sky window. YOUR DATA STAYS ON YOUR DEVICE No account. No analytics. No tracking. All logs, sessions, and equipment records are stored locally using SwiftData and never transmitted anywhere.