Planet Fun is a 4D solar system simulation.

Planet positions are calculated using VSOP2013 ephemeris, years between 1500 and 3000.
App open source code (Delphi) available at
https://github.com/omarreis/vsop2013/tree/master/planetfun

Program features:
Solar system animation with configurable speed
Choose camera target (Sun or planets)
Set date/time between years 1500 and 3000
Configurable distance-to-target
Touch gestures: one finger pan, two finger zoom, two finger rotation
Planet orbit dots. Each orbit is represented by 52 dots (For the Earth, its one dot per week)
Heliocentric axis (x and z)
VSOP2013 high res planet positions
Moon position calculations
Star background with 42455 stars of the Hipparcos Input Catalogue
Uses phone sensors ( compass, gyro and GPS ) to control 3d phone attitude
The phone in the scene is positioned with phone sensors
(GPS, gyro and compass)