Visual Observational Astronomy
- Google Sky Map - Planetarium application, uses acceleratomers to show stars in the direction the phone is facing
- Moon Phase / Moon Phase Pro - 3D interactive display/simulation of the Moon
- SkEye - Planetarium application, similar to Google Sky Map but with more features and information. (Paid version available)
- SatTrack - List and alert of satellite flybys (donate version available).
- Clear Sky Droid - Viewer for Clear Sky Chart
- Sidereal Clock - Utility that shows current sidereal time and UTC (Paid version available)
- Astro Panel - astronomical weather viewer (using 7timer information). Also includes ISS passes and darkness/twilight information.
- PlanetDroid - Ephemeris calculator for planets, comets and NEOs (donate version available).
- Galaxy Zoo - Helps the Galaxy Zoo project towards classifying galaxies using SDSS images
- NASA - Official app with NASA TV viewer, News, Missions and APOD viewer/background setter.
- NASAImages - unofficial Astronomy Picture of the Day (APOD) viewer, easy to set pictures as background
- Adobe Reader - The standard PDF reader
- arXiv Droid - Searches and downloads articles from arXiv. Uses Adobe Reader or another PDF reader for most articles.