Xasteria helps you decide if tonight is worth observing. It brings together astronomical weather forecasts, sky conditions and observing tools in one ad-free app, built around the 7Timer ASTRO forecast.
Configurable forecast sources:
• 7Timer / GFS, worldwide coverage, ~20km resolution:
· Cloud cover (with layer breakdown)
· Astronomical seeing
· Atmospheric transparency
· Temperature and humidity
· Rain / snow
· Atmospheric instability
· Wind speed and direction
• MET Norway, based on the ECMWF model, particularly useful in regions with significant terrain variation
• Multi: combines MET Norway’s short-term forecast with 7Timer astronomy data. Disagreements are highlighted.
Sun/moon details:
• Sun / Moon rise, set and twilight times.
• Moon phase and elevation.
Tools:
• Aurora forecast, with worldwide and local data/maps.
• ISS and satellite passes for your location, plus NASA’s ISS Live Feed.
• Interactive Light Pollution map using World Atlas 2015 or Xasteria/VIIRS 2025 data.
• Quick access to Clear Outside, Meteoblue, Windy, Astrospheric, Sat24, water vapor satellite imagery and more.
Display
Three display modes: 7Timer icon/graphic view, color-stripe view, or raw text. The left panel can be switched to icons, and summary icons and cloud layers are configurable in settings.
This app will always be ad-free, with no in-app popups asking for reviews. If you would like to support it and the 7Timer service, Xasteria Plus adds an Apple Watch app, Home Screen widgets, OpenWeather real-time forecasts, Apple Weather, satellite maps and tracking, night vision mode, lunar calendar, solar eclipse tools and more.
A quick rating or review on the App Store is always appreciated. For suggestions or feedback:
http://astro.ecuadors.net
Extremely useful in planning observing sessions with all weather-related information I need presented in clean, straight-forward manner. Also like the added “alternative forecasts” feature that makes the NOAA satellite service and Clear Outside weather applications available. Recently I needed information for several areas on the US west coast plus several towns along the western Mexican coast but after my trip they were still listed in the app but no longer needed. Sent a note to Dimitrios asking if he could add a feature whereby unwanted locations could be removed. He actually put that in the latest revision and then sent me a note letting me know that that feature I requested was now available!
My Go-To App for Astro Weather
PaplooTheLearned
This is always the first app (and often the only app) I check to plan what nights I should pull out my telescope.It does a brilliant job of making it easy to see astronomically related forecast data from a variety of sources (some of which have no mobile apps), allowing me to easily compare to see what the forecast really looks like.
Favorite app to plan observing
NeoObserver
Xasteria has become my go to app to plan observing sessions. Over the last three years it has continued to improve so that I now turn to it first. The improvements I value most are improvement of its weather prediction, incorporation of link outs to other prediction models and several smaller usability improvements.
It Just Works
CEW58
It tells me everything I need to know about the weather conditions I can expect when planning a night out with the telescope
Developer Response
Thanks for the updated review. The app has come a long way from when it was relying on the original "low-availability" 7Timer servers ;)
• Redesigned Light Pollution tool with an interactive map using World Atlas 2015 or Xasteria/VIIRS 2025 data. Pan, zoom and tap any location for sky brightness and approximate Bortle estimates. Includes road and satellite backgrounds, adjustable opacity, night colours and an expandable information panel.
• New Multi forecast combines 7Timer astronomy data with the optimal short-term forecast from MET.no or Apple Weather, then blends both sources beyond a configurable crossover time for a longer, steadier forecast. Tap marked disagreements to compare the original data.
• Redesigned settings screens, with integrated help.
• New ISS Live Feed lets you watch NASA’s live video stream from the International Space Station.
• A vertical line on Sun and Moon altitude charts now indicates the current time.
• New coordinate units setting: DMS or decimal.
• Fixed Himawari and Eutelsat links
• Various help, localisation and visual fixes.
A quick rating or review on the App Store is always appreciated. For suggestions or feedback:
http://astro.ecuadors.net
Version 5.2
The developer, Dimitrios Kechagias, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Privacy practices may vary, for example, based on the features you use or your age. Learn More
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
Seller
Dimitrios Kechagias
Size
7.3 MB
Category
Weather
Compatibility
Requires iOS 13.0 or later.
iPhone Requires iOS 13.0 or later.
iPad Requires iPadOS 13.0 or later.
iPod touch Requires iOS 13.0 or later.
Mac Requires macOS 11.0 or later and a Mac with Apple M1 chip or later.