The Light for Night Vision app turns the display screens into a redcolor light.

The Solar Book is an app for smart-phones and tablets for a solareclipse.

Eyepiece Book (eyepiece book) is an application that displays howthe moon and planets look like by combining an astronomicaltelescope and eyepieces.

Planet Book is, Venus, Jupiter, planets such as Saturn, to displaythe Where is in the stars, planet observation support app.

TimeLapse Book is movie simulator the stars of the time-lapsephotography

The 3D view is available for viewing Comets and planets turningaround the sun.

Interval Book Interval image (multiple exposure) of the moon andthe sun is a simulator of shooting.

The Mars Book app is dedicated for observing Mars close approach inautumn 2020.