Astronomy5 Planner

Precise observation planning and telescope navigation for visual observers, observatories, and astronomy education. 100% offline field-ready – no account, no tracking, no ads. Features at a glance: 🪐 Solar System & Daytime Observing: • Accurate rise, set, and transit times for the Sun, Moon, and planets. • Daytime planet visibility indicator with vital solar filter safety warnings. • Moon phases, libration, and visual Venus phase state. 🌌 Deep-Sky & Object Catalog: • Curated catalog of nebulae, galaxies, star clusters, and double stars. • Filtering by altitude, Bortle light pollution level, and object class. • Interactive finder and eyepiece maps featuring Telrad rings and exact telescope optics simulation (Newtonian, Refractor, Zenith mirror). 🔭 Push-To Telescope Assistant (DSO Pointer): • Turns any telescope (Dobson/Alt-Az) into a digital Push-To system using smartphone sensors. • Precise 3D rotation matrix (Kabsch-Slerp) via 3-star calibration compensates for mechanical mounting offsets. • Live directional guidance (dAlt / dAz) for quick object alignment in the eyepiece. • Operates completely offline in the field. 🌤️ Astro Weather & Observing Conditions: • Dynamic evaluation of daytime and nighttime observing conditions. • Hourly cloud coverage forecasts (low, mid, high) and automated dew point warnings. • Interactive Bortle star test to measure local light pollution. 🛰️ ISS, Comets & Eclipses: • Live map and visibility forecasts for ISS passes. • Currently bright comets (filtered for visual observer feasibility). • Eclipse calculator up to 2075 with local obscuration calculations. • Aurora and space weather forecasts (Kp index). Practical Field Features: • 100% Offline Capability: All ephemerides, star maps, calculations, and 3-star Push-To finder run entirely without an internet connection. • Red Light Mode: Dedicated night mode to preserve dark adaptation under the night sky. • Privacy First: No user accounts, no tracking, no advertising.