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Xasteria - World Weather Report for Astronomy

By Dimitrios Kechagias

This app is only available on the App Store for iOS devices.


Xasteria brings the Astronomical-oriented ASTRO weather forecast of the service 7Timer! to your iOS device. You can use your device GPS for a forecast of your location, or enter manual coordinates.
ISS passes and Iridium flares for your location are also shown (data from
Quick access to astro weather web sources an the latest water vapor satellite images is also provided.

7Timer! is mainly derived from the NOAA/NCEP-based numeric weather model, the Global Forecast System (GFS) and gives you a forecast for the entire globe with a resolution of about 20km at 3-hour intervals.

The data provided includes:
-Sun/Moon rise/set & twilight times.
-Moon phase.
-Cloud cover.
-Astronomical seeing.
-Atmospheric transparency.
-Atmospheric instability.

Xasteria provides you with a choice of 3 visualization modes for the data: the new 7Timer! ASTRO graphics, the color-stripe graphics similar to some other astro-forecast services and a raw text mode.

Xasteria is available in English, Greek and French. If you would like to translate it to your own language, please contact the author.

A special version of Xasteria is included in the Polar Scope Align Pro app, taking advantage of that app's night vision mode and location manager.

I would appreciate a quick review on iTunes if you are using the app - if you have a specific request/suggestion you can also try the official app page at

What's New in Version 1.11

As Xasteria never nags you with popups about a rating/review, it gets very few ratings despite the number of users. So, if you use the app perhaps you could consider doing a quick rating/review on the app store.

-Added French localization.
-Quick access to the latest Water Vapor satellite images.
-Improved contrast in some pages.


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Customer Reviews

Accurate and easy to use

I think I have tried all of the astronomical weather apps and I think this one is accurate and easy to use. Lastly, the author is responsive and adds new weather services as needed.

Great all around astronomy weather app, but not perfect

It works great for where I live in Philadelphia, but when I travel to the Greek islands it's pretty inaccurate

Xasteria - World Weather Report for Astronomy
View in iTunes
This app is designed for both iPhone and iPad
  • Free
  • Category: Weather
  • Updated:
  • Version: 1.11
  • Size: 3.9 MB
  • Languages: English, French, Greek
  • Seller:

Compatibility: Requires iOS 6.0 or later. Compatible with iPhone, iPad, and iPod touch.

Customer Ratings

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