Astronomy5 Planner

A5P

In-app purchases

About this app

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.