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.

What’s New

Version 2.4

Comet's passing through date at perihelion or perigee is available for display on the screen.
When Comet passed the best time to view, the date you boot the app is set in the center of the Date and Time slide bars.

Ratings and Reviews

Halfdonkeyed ,

Missing magnitudes

Also missing easy way to set time to right now. Date time and vector text could be larger.

Great for free :)

Letleb ,


Can't read the text, but does the job! At least for panstarrs.

Spajd1446 ,

No English..

It's a great app over its just not in English.


Vixen Co., Ltd.
17.9 MB

Requires iOS 8.0 or later. Compatible with iPhone, iPad, and iPod touch.


English, German, Japanese

Age Rating
Rated 4+
© 株式会社ビクセン


  • Family Sharing

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

More By This Developer

You May Also Like