iCSC: Clear Sky Chart Viewer

Choosing when and where to observe is hard. It's a pain to take out your telescope and then having to put it away when clouds quickly roll in.

Category	Price	Seller	Device
Weather	Free	Random Widgets Inc.	iPhone, iPad, iPod

Well, now you don't have to. With iCSC on your iPhone, you can easily search around for the best location, using Clear Sky Charts published by Attilla Danko.

The Clear Sky Chart, invented and maintained by Attilla Danko, shows at a glance when, in the next 48 hours, one might expect clear and dark skies for a specific observing site.

There are over 4600 charts available for North America, with data provided by Allan Rahill of the Canadian Meteorological Center. These charts provide Cloud Cover, Transparency, Seeing, Darkness, Wind, Humidity, and Temperature. Users can also enable a legend to help read the charts.

iCSC allows users to find charts by title, location, or with a map. Users can then save the charts that they use often.

While Clear Sky Charts are targeted at astronomers, anyone who wishes to look into the heavens, or needs a highly accurate sky forecast can benefit from iCSC: Clear Sky Chart Viewer.

Reviews

Six stars
Alcona Up North

I would rate it 6 stars if I could. Very useful app.

Can update the forecast more frequent, at least once in the afrernoon
oaknoba

Wondering if its possible to access the backend data source of a specific location, so I can query updated info on demand. Cloud in my area changes frequently, there are a few times the app wasn't able to catch it up until last minute and that makes the plan have to be cancelled.

Gr8 app
3wheelsdown

I have been using this app for years. It seems to be a very accurate forecasting tool.

Handy tool
SmithK7.62

Lots of “seeing” information and forecasts at my fingertips. Helps me plan for an evening under the stars with my telescopes.

Good but...
Querty(1970)

Wish they explained what each category meant in terms of overall ability to see the stars.

Best app for dark sky forecast
astrokent

Thanks to great data from the Canadian Met Office and great software from Atilla Danko, the astronomy sky forecast is used by astronomers all over North America. This convenient app is great since I can save my favorite observing locations and check out the sky forecast before I head out to observe. Well done!

Fast Chart
Astro guy in pa

Quickly brings up your local Clear Sky Chart for astronomical observing or photography. Does not bring up maps like the original website though.

Indispensabile
Austin Star Watcher

Best and most reliable for amateur astronomers Tim Brown

Very Accurate!
YeahItsCollin

I use this for astronomy and astrophotography to help plan my time under the stars. It’s very accurate even though the closest data collection site is 20 miles away. I use this app constantly, very simple to use, and has all the information you need to consider for your Astro Endeavors.

Nice app
Jimr4/15

Nice to have access to the charts on phone anytime and anywhere. Works well. Also nice to be able to be able to save the sites you use as favorites. Very nice predictive software so you can plan your viewings and know what to expect for upcoming observing conditions