Nicolas Beuzeboc has updated his homebrew game for the Nintendo DS, heres what he says:
New release, this time i used DS 3D mode to display stars on a sphere surface, the observer is located at the center of the sphere and can rotate on 3 axis with D-pad, A and B, change the field of view with L and R, and change the number of star displayed with select and start.
Changing the field of view isn't a good solution to have a nice full hemisphere view. I'll need to translate back and cancel the closer hemisphere display.
I'm going to add stars color in the next release, and display some information on the bottom screen. I'll work on a stylus control.