Astronomy5 Planner

A5P

In-app purchases

About this app

Discover the night sky – precisely planned for your location.

Originally developed as a tool for astronomy education, the **Astronomy5 Planner** is now the perfect companion for entering the world of visual astronomy. Whether you are a teacher planning your next class, taking your first steps at the telescope, or just need a quick overview as an experienced stargazer: See at a glance what is worth observing tonight (or during the day!).
Use the core features for free forever, or unlock the full universe with the Pro version (fair one-time purchase, no subscriptions!).

**Free Core Features:**

🪐 **Solar System & Daytime Observation:** Precise rise and set times for the moon and planets. Unique: The app shows which objects are visible during the day (e.g., for school classes) – including vital safety warnings.

🛰️ **ISS Tracker:** Live map and precise forecasts of visible passes for the next few days. Never miss the bright dot of the space station again.

🌠 **Meteor Showers:** The best annual meteor showers at a glance, including a lunar interference indicator.

🌌 **Deep Sky Overview:** Curated lists of the most beautiful nebulae and galaxies, including constellation maps (Level 1) for basic orientation.

🌤️ **Astro Weather (Basic):** A dedicated observation planning dashboard featuring dynamic time windows for day and night, plus a quick overall assessment of conditions.

🖼️ **Astro Gallery (Daily 20s):** Daily changing, random NASA astrophotography.

**Pro Features (One-time purchase):**

🔭 **Smart Starhopping (Deep Sky Pro):** Unlock the deep interactive zoom maps (finder & 4° eyepiece views), Telrad rings, and exact telescope optics simulation (Newtonian, Zenith mirror).

☁️ **Advanced Astro Weather:** Hourly forecasts for your observing night. Includes detailed cloud layers (low, mid, high) and pro metrics like an automatic dew warning (protects telescope lenses from fogging).

✨ **Interactive Bortle Test:** Determine your local light pollution via an interactive star test on the real sky. The app automatically filters deep-sky objects accordingly (e.g., warning you if an object is "Washed out").

☄️ **Bright Comets:** No more outdated databases! We only show comets currently bright enough for amateur telescopes or binoculars (data from COBS & MPC).

🌟 **Aurora & Space Weather:** Live data (solar wind) and 3-day forecasts. Includes background alerts for high geomagnetic activity and noctilucent clouds (NLC) forecasts.

🌑 **Eclipses:** Preview all solar and lunar eclipses up to the year 2075 with pinpoint local visibility calculation for your location.

**Why Astronomy5 Planner?**
• **Built-in knowledge:** Numerous ⓘ-buttons explain astronomical concepts and observation tips right where you need them.
• **Privacy:** No user accounts, no tracking. Your location is processed locally.
• **Offline capable:** Many features (like star maps and ephemerides) work without the internet.
• **Night-friendly:** Built-in red-light mode to protect your dark adaptation at the telescope.
• **Ad-free:** Focus on what matters.

Start your journey through the universe now!

What’s new

• FIXED: Corrected timezone calculation bug affecting night window visibility globally.
• IMPROVED: Smooth, seamless moon phase calculations without day-to-day jumps.
• NEW: Automatic hemisphere detection (North vs. South) for the Bortle sky quality wizard.
• Performance and stability improvements for the slideshow and offline field mode caching.