Comet Book is an iPhone app designed to assist users in locating and observing comets in the night sky. The app provides information on when comets are visible and their respective directions. With comets' fast apparent motion, this tool helps users track their movement accurately. Additionally, users can utilize the app to pinpoint a comet's position in the sky from their observing location, making comet watching more accessible and enjoyable.

Moreover, Comet Book introduces a unique feature called "3D Solar System seen from Space," enabling users to visualize comets and planets orbiting the sun. This mode offers a fascinating perspective on comets' trajectories within our solar system, enhancing the understanding of celestial movements.