Mobile apps that support astronomical observation

Mars reaches its closest point to the earth on May 31. Furthermore, the Venus reaches closest point to Jupiter on August 28. However, can we observe it in the most suitable when and where? This Planet Book simulates the movement of the planets and supports astronomical observation.

This shows planets appear from which direction, when and how. The waxing and waning of the Mercury and the Venus, position of Jovian satellites and Jupiter's Great Red Spot, Martian surface texture etc.. Users can know these by checking application beforehand. Of course not only planets but also the constellations are displayed, and users can simulate the starlit sky-displaying method by binoculars and the astronomical telescope, too. When a screen is too bright, users can change it to a night vision mode. As for the downloading, both iOS/Android is free.