To the left are three sliders that allow you to rotate the view along different axes.
To the right is a single slider that allows you to zoom in and out. At the lowest setting it shows roughly 100 lightyear vicinity of the Sun, at the highest it is at infinity.
Misfeatures and bugs: whenever one of the boxes is checked or unchecked the database is reloaded; this should be fixed. Also, the rotations are rather confusing. The projection os orthonormal, so sometimes remote objects might appear in the middle of a zoom and look like they are close to the sun; when the scene is rotated this will be quickly revealed.