Csilszim

This is an astronomical simulator for Android. It provides useful information for observation of Messier objects, planets and so on.

Clock with Planisphere

This is a clock application with a planisphere for Android. The planisphere shows the current sky at the observation location by setting the latitude and the longitude. You can switch the northern and southern celestial hemispheres. The application name was changed in April 2023.

Clock with Planisphere lite

This is a clock app widget with a planisphere for Android. The planisphere shows the current sky at the observation location by setting the latitude and the longitude. You can switch the northern and southern celestial hemispheres. This app has no ads, but you cannot choose the date and time of observation. The application name was changed in April, 2023.

Celestial Positions

This is a application that shows the current position list of Messier's objects and bright stars at your location. It is useful for pointing an uncomputerized telescope at Messier's objects.

Digital Quadrant

This is an astronomical quadrant application for measuring the altitude of celestial objects above the horizon. It has 2 modes, cameraless-mode and camera-mode. Don't use camera-mode for measuring the altitude of the Sun. The camera of the phone may be damaged.