iPhone Screenshots


Carry your favourite Clear Sky Charts (CSC) in your pocket! Amateur astronomers in North America monitor local sky conditions using the CSC web sites which provide a very detailed 48 hour color coded observing forecast chart for cloud cover, transparency, seeing and other factors. This app contains a database of more than 5200 forecast locations in Canada, the USA and Mexico and can check for new updates. The launch screen monitors up to four or five favourite observing locations. Each square represents one hour and the colors vary from dark blue (excellent) to white (very poor) conditions for observing. A red line indicates local midnight and there is a last updated timestamp. Tapping on any preview chart will open a menu of options that allows you to (i) see a more detailed chart with legend, (ii) map the chart location, (iii) open the CSC web page, (iv) select a different chart location to monitor, (v) remove unwanted charts or (vi) share one of your charts via email, text message or social media. Locations Services can help you find nearby CSC locations when you travel.

Refer to Attilla Danko’s excellent CSC web site home page for complete details on interpreting the preview and detailed charts:


A complete PDF user manual is available on my website:

http://anythingbinary.com/iphone/myCSC/myCSC iOS User Guide.pdf

This app is no longer free. A portion of every copy purchased will go to Attilla Danko to help support the ongoing operation of the Clear Sky Charts site.

What’s New

Version 2.0.4

Minor release to fix:
Screen layouts for devices with 3:2 aspect ratio.
Database includes 5228 Clear Sky Chart locations.
Pop-up menu on Set Nearby Chart Location so it only displays once.

Ratings and Reviews

sammyt4041 ,

Essential for the Amateur Astrophotographer

I have been an astronomy obsessed amateur astrophotographer for three years now. I rely heavily on my phone; there are three apps which I use every single time I set up for a night.. This is one of them. Gives accurate info in an easy to understand format... What more could I ask?!

On those nights where clouds ruin the fun, I often roam the map, salivating over the clear skies of locations far from mine. In fact, every time I travel, this is the first app I open to see what the night sky will hold for me when I arrive!!

It would be cool if the app had some additional features, but none are even worth mentioning because the app is FREE. Considering my other must-have astronomy apps cost embarrassing-to-admit amount, I couldn't be more pleased with myCSC!

JamesGUI ,

Handy Little App!

This little app capitalizes on the Clear Sky Charts (CSC) site and services astronomers rely upon for accurate sky condition forecasts. In this version one can select and display three sites for which CSC makes predictions and see the latest updated compact versions on the app's main screen. Tap one of those strip charts and the user is offered the corresponding Detailed Chart, a visit to the full CSC Site, or the Map Location of the observing site. My only, slightly nit-picky, criticism of the app is that Detailed Charts, when displayed in landscape on my iPod Touch, appear slightly "squashed." I won't complain much, however, because the entire chart is displayed, it is legible, and this app makes it easy to access the lightweight data from just about anywhere.

Quantum Cop ,

Very Nice

This is a great app to have if you're an amateur astronomer like me. It provides all the most relevant forecast data, including cloud cover, transparency, viewing quality, humidity, and more. It's nice to be able to have this info immediately on hand.

I would like it better, though, if it included the ability to store more than three locations at once. I've also noticed that it has a tendency to crash often. Fix the stability issue, and you've got yourself a five-star review. Very nice, and useful, for a free app.


Anything Binary
47.1 MB

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



Age Rating
Rated 4+
© 2016 Anything Binary, All rights reserved.


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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