An apparent brightness is the brightness of a star as measured by an observer.

Absolute Brightness: How bright a star appears at a certain distance.

Apparent Brightness: The brightness of a star as seen from Earth.

The brightness as seen from Earth is called the "apparent magnitude".The real brightness (defined as the apparent brightness, as seen from a standard distance) is called the "absolute magnitude".

The brightness levels on a DSiXL can be changed to be from a brightness of 1(lowest) to a brightness of 5(highest). The screens can be dark depending on where you are.

Theres `Absolute Magnitude` which is the brightness of a star at a set distance. Then there is `Apparent Magnitude` which is the apparent brightness from earth, regardless of distance.