iCSC: Clear Sky Chart Viewer
Astronomy forecasts for all
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Description

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.

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.
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User Rating

4.85 out of 5

1,373 ratings in United States

5 star
1,218
4 star
124
3 star
20
2 star
2
1 star
9

Ratings History

Reviews

Must have for astronomy!

Zzzmdf on

We have used CSC for over 20 years, and it has been consistently the most accurate forecast out there! Updates occur daily, and sometimes, seems to be more frequent than that. Seldom if ever significantly wrong, and if you want your own map, it is a simple process of uploading your coordinates. My go to whenever considering observing.

Great for everyday use

Basst82 on

The only thing that has ever “fooled” this app in my experience is marine layers by the coast (Seattle, Oregon coast, BC). Otherwise, amazing tool, super accurate and easy to use once you get the hang of the charts and legend. Highly recommended

Search is useless, missing many locations

macTVman on

I had a 10 year old clear sky clocks program that no longer worked when I updated to new phone and latest OS. It easily found locations near me This app only finds a limited number of the Clear Sky Sites available on the website, and you have to know the EXACT naming and wording of the entire clock title. Clear sky locations I’ve used for decades aren’t in this app’s list. Useless, wish I could give it Zero stars.

no key to charts

Dodeka on

it may be accurate, but with no key to the charts, who knows what color is what. If you're new to Astronomy, it's pretty much useless.

NO TOO IMPRESSED

Holzydog on

This version for my iPhone doesn’t allow me to pick/select favorite locations. In fairness the version I have on my Mac works fine.

ABSOLUTE NECESSITY FOR ASTRONOMY

RN Dave on

This is my first, and often only, go-to for astronomical seeing details. It’s fundamentally necessary.

Clear Sky Chart

USAstronomer on

Simple and useful.

Awesome

3lit31 on

This is great weather guide fo clear skies. It is my go to app for star gazing. Very accurate. Highly recommended!

Not bad, but horrible viewing on iPad

Flea77 on

The data isn’t bad, but it is all but unusable on my 5th gen iPad Pro 12.9. Tiny text you can’t zoom in on. MyCSC is a much better choice for iPad users.

A great, near-term weather app

SBrown57 on

It’s nice to have access to accurate, near-term weather data when you’re trying to spot distant galaxies or take night photos. This app makes that possible.

Store Rankings

Ranking History

Category Rankings

Chart
Category
Rank
Top Free
126
Top Free
222
Top Free
252
Top Free
382

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App Info

Category
Weather
Publisher
Random Widgets LLC
Languages
English
Recent version
1.2.5 (6 years ago )
Released on
Jun 22, 2014 (10 years ago )
Last updated
7 hours ago