What is the difference between alignment type direct (dark sky) and indirect (bright sky) in the manual mode?

What is the difference between alignment type direct (dark sky) and indirect (bright sky) in the manual mode?

STELLINA uses the stars to figure out its position in the sky.
- Choose Direct alignment if there are enough bright stars visible in the target field.
- Choose Indirect alignment if there are not enough stars visible in the target field (for example, near the horizon at dusk). In that case, STELLINA will first look for stars higher in the sky, then point down at the target.
- In the Auto mode, STELLINA first tries a direct alignment and falls back on an indirect alignment if the sky is too bright.