Planet Book is an educational app developed by Vixen Co. Ltd. that assists users in observing and locating planets such as Venus, Jupiter, and Saturn in the night sky. As the name suggests, planets can be quite elusive, constantly changing their positions among the stars. This makes it challenging for beginners in astronomy to identify which planet is shining where at any given time.

With Planet Book, users can specify the date and time to view a visual representation of the night sky, showing the exact positions of the planets on a star chart. Furthermore, by enabling the "Device Tracking Mode," users can see real-time information about which planets are currently visible in the direction they are pointing their smartphone.

One of the unique features of Planet Book is its ability to provide information about the changing distances between Earth and the planets. This allows users to determine optimal observation opportunities when planets are closer to Earth and appear larger in the sky. Additionally, the app includes a simulation feature that allows users to select different telescopes and eyepieces from Vixen's product lineup, providing a visualization of how planets would appear through different combinations of equipment.

Unlike faint celestial objects such as the Milky Way or star clusters that are difficult to observe without venturing into dark skies, planets can be seen even in urban areas with significant light pollution. Have you ever looked up at the night sky and wondered about those bright, shining objects? They might just be planets. With Planet Book, you can easily locate and identify them. And if you have a telescope, you can further enjoy the beauty of these celestial wonders.