1.[Star list] page is shown when app is starting.The page has list of star with planet(s).
Tap the star you wish to search its planet ,then [Star's detail] page opens.
2. [Star's detail] page expresses data of the star and shows a image of the star and the sun for comparison of size.(When the data of star's radius is unknown,image of the sun is not shown.)
The star is drawn on upside of the image and the sun is shown on downside of the image when the screen is portrait.
Tapping the floating action button on lower right opens [Planet's orbit] page.
3.[Planet's orbit] page displays orbit(s) of planet(s) in the star system.
Swiping screen right and left or up and down ,you can see the orbits from different directions.
You can change the size of image by pinching in /out.
Tapping long on the screen shows [Select planet] dialog. If you select a planet,[Planet's detail] page opens and the data of the selected planet will be displayed.
You can also open the page by tapping the floating action button.
4.[Planet's detail] page explains the data(mass ,radius and so on)of each planet.
5.Swiping from left reveals the page menu . Tapping button(三) on left top in the action bar also shows the page menu.
You can open any page by tapping on the menu.
About units used in [Star's detail] and [Planet's detail]
・Msun :Mass of the sun
・Rsun :Radius of the sun
・pc :persec = about 3.26 light year
・au :astronomical unit
・Mj :Mass of Jupiter
The source of extrasolar planet data using in the app is [The Extrasolar Planets Encyclopaedia](URL:http://exoplanet.eu/).
(At May 27,2017)