CoolSky for Windows

Name: CoolSky
Rating: 3.3 (12 reviews)
Author: Piotr Czerski

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Editors’ Review

Download.com staffFebruary 26, 2026

CoolSky is a Windows planetarium program that provides realistic sky views from any location on Earth. It uses OpenGL for high-fidelity rendering and offers extensive object information.

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Free

Pros
- Highly realistic sky views
- OpenGL rendering for maximum realism
- Extensive object information available
- Smooth solar system animation
- Printable star charts and screen images
Cons
No Cons available

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Full Specifications

GENERAL

Release: March 26, 2002

Latest update: February 26, 2026

Version: 2.0

OPERATING SYSTEMS

Platform: Windows

Operating System

Windows NT
Windows 95
Windows 98
Windows XP
Windows 2000
Windows 10
Windows ME

Additional Requirements: Windows 95/98/Me/NT/2000/XP

POPULARITY

Total Downloads: 5,144

Downloads Last Week: 8

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Last Updated

User Reviews

3.3/5

12 User Votes

First class astronomy program
September 11, 2002
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This is definitely a sweet program.
I love it!
August 10, 2002
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CoolSky is a great program. Just love it! Beautiful and very easy to use. I definitely recommed it.
My favorite astronomy app!
July 29, 2002
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I just wanted to tell how much I like this program and enjoy using it.
Congratulations !!!
April 11, 2002
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This is the most interesting planetarium I've seen recently. I recommend it to everyone interested in astronomy. As for The Phantom Reviewer - you have probably tried a quite different program. On my computer everything looks perfect. You shouldn't compare it to those mentioned programs - especially to Coeli which is much below average. I suspect you are the author of one of those apps. This could explain your effort in writing such reviews and why you have submited yours twice.
April 10, 2002
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Do we really need another average planetarium?
April 3, 2002
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Just one more in the recent spate of Cybersky-clones... Seems identical graphically to Mr Czerski's other effort, Astronomica. Indeed, I could detect nothing special or original in the graphical display of the sky here. The grids didn't draw correctly, being fragmented. Poor in features and usefulness, just like Winstars and its ilk. My recommendations: try Coeli, SkyMap, or Mystars -- truly "old reliables" which are unlikely ever to be bettered...
Do we really need another average planetarium?
April 3, 2002
Pros
Cons
Summary
Just one more in the recent spate of Cybersky-clones... Seems identical graphically to Mr Czerski's other effort, Astronomica. Indeed, I could detect nothing special or original in the graphical display of the sky here. The grids didn't draw correctly, being fragmented. Poor in features and usefulness, just like Winstars and its ilk. My recommendations: try Coeli, SkyMap, or Mystars -- truly "old reliables" which are unlikely ever to be bettered...
April 3, 2002
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good
April 3, 2002
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good
April 2, 2002
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Developer’s Description

By Piotr Czerski

Observe the sky as from any location on the Earth.

CoolSky is a Windows 9x/NT/XP based planetarium program,that offers highly realistic views of entire sky from any place on the Earth. CoolSky is built in OpenGL technology that allows to render celestial objects in the highest possible level of realism. Extensive information about objects is available after single mouse click. It can also smoothly animate solar system objects, create star charts on the printer and display photographic images on the screen.

CoolSky for Windows

Editors’ Review

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Z-Calculate

Pros

Cons