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About the application:

** User's Tutorial http://coskx.webcrow.jp/mrr/CPGuide/guide.html ** Overview + The apk is a planetarium application.You use the apk by holding the device up over your head. + Displays constellations, planets, moon, and sun seen from the ground as 3D models. + You can board on a horizontally launched spacecraft, move out of the earth while watching the moon, and look over the earth, the moon, the sun, the planets. You can check the relationship between the phases of the moon and the position of the sun, the earth, and the moon. + You can also check the appearance of the inner/outer planet and its position on orbit. + It is a learning astronomical application that lets students and teachers and family have fun together. ** Main Operation + You can change the viewing direction by holding the smartphone over the sky. + You can depart in place with the rocket button at the far right of the screen and return to the earth. + When the viewpoint is in outer place, you can change the viewpoint with two finger swipe. + The viewing angle (telephoto/wide angle) can be changed by the + - button or the scaling operation with two fingers. + Even devices not compatible with attitude acquisition sensors can be operated in manual mode. (In this case, use 1-finger, 2-finger operation.) ** Functions for Learning + When you press the moon-phase observation button, it will shift to the date and time suitable for observation of crescent moon ,the half moon , or the full moon. After checking the observation time, the shape of the moon, the direction from the ground viewpoint, move seamlessly to the put looking over the earth, moon, and the sun and check the positional relationship of the earth, moon, and sun. + The date and time (Tokyo) suitable for the observation of the solar eclipse is set by observation button. You can check the missing sun, move out of the earth and observe the shadow of the moon around Japan. Further a tiny further away, move to the put that overlooks the Earth, moon, and the sun and confirm the positional relationship. + The date and time suitable for observation of the lunar eclipse are set by observation button. Check the moon turning red and move to the put that overlooks the Earth, Moon, and the Sun and check the positional relationship. You can also observe the phase/apparent size of Venus and the positional relationship of Venus/Earth/sun. The dedicated observation button is not yet implemented. ** Motivation for Development There are a lot of astronomical apks. It is divided into a planetarium of the geocentric theory kind which tutorials the constellation, the planet etc from the ground and the place tour kind astronomical tutorial application. When learning the change of the shape of the moon and the position of the moon, it is convenient if we can move from the ground where we see the moon to outer place where we see the earth, the sun and the moon by the sightseeing spaceship. It is important to be able to move continuously, not viewpoint switching. I wanted to create a planetarium that unified the viewpoint looking up from the earth and the viewpoint overlooking the planets of the solar system including the Moon and the Earth. In addition to looking up at the starry sky, the apk moves the viewpoint to outer place continuously and reproduce the starry sky including the earth. So I named it "Copernican Planetarium" (the heliocentric theory). ** Help for android device device + In the setting of the observation put, you can enter the latitude and longitude with a number. You can also use the current place info held by the device, but in that case please let the usage authority and set the current place availabe. + For devices with gyroscope, it is simple to acquire the device posture, so you can see the starry sky in the direction you held it. Even for devices without gyroscope, posture will be acquired from acceleration sensor etc, but tracking speed/stability will be low.