466 reviews
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About this app

The Comet Book app clearly shows when Comets can be viewed and in which direction. The direction and elevation of a Comet can change noticeably in a day due to its fast apparent motion. The moon and a bright planet may be convenient as a guide to find the comet though they have large apparent motion, too.

This app determines where Comet is in the sky when it becomes visible at your observing site. You can easily start your observation of a Comet by using Comet Book as a guide to the direction and elevation of the comet.

In addition, the new “3D Solar System seen from Space” mode allows you to view the motion of Comets and planets turning around the sun. Please take a look the comet’s movement around our solar system.
Updated on
Oct 2, 2023

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
No data shared with third parties
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No data collected
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Ratings and reviews

432 reviews
bubba fat
July 22, 2020
The time is off by an hour in July at NYC. On Android version, but it is fine on iPhone version. If i look at location of the sun, the app shows it's below the horizon, however the sun doesn't set for another hour. Probably the app didn't take account of daylight savings time. I have to move the time in the app back one hour for accurate, current locations of objects in the sky.
11 people found this review helpful
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Audi McAvoy
July 28, 2023
Website link under "Developer contact" in Google Play is broken. No reply to email link after 48 hours. Using the "Contact Us" in the app (buried at the bottom of the Support Page found from the Help menu) is tedious at best. Not worth the effort to use only to find that it doesn't work (confidence is not high that it will). The real problem is: the app is only showing two comets (neither of which are currently visible). And I cannot figure out how to add/update the comet information.
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Karly Narvaez
July 24, 2020
Has a lot of potential however, it and inaccurate prediction of where the comment is, possibly because it may not compensate for where on the earth the user is or for the local time zone. Yeah but gives one location I went through a website and it gave me another location, and it was only when I checked the website that I was able to locate the comet. The way the app is structured is great and the display is great, so it has potential however this is a critical problem that needs to be fixed
4 people found this review helpful
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What's new

Some bugs have been corrected.