An orbit at night, on a dark night flying from a lighted area to a dark area, is not an adviseable maneuver, as is evident by the very large altitude variations that occurred during the first orbit, spatial disorientation was present then as well, as was a loss of situational awareness, as is evidenced by the subsequent overshoot of the runway extended centerline, thus requiring the fateful go-around, which again was not flown to SOP's. daylight clear conditions are entirely another matter, as visual references would have been sufficient to preclude the onset of vertigo. In any case, it is clear that training crews to avoid these conditions that lead to spatial disorientation needs to be emphasised, no experience level can preclude the onset of spatial disorientation, it can and does happen to pilots of all experience levels, however, a more experienced pilot is more likely to realize the potential for this problem, and adhere strictly to standard operating procedures, and carry out a proper go-around...training...training...training...is the key. Let's all hope GF has risen to the occasion, and remedied the problem. I still fly as a pax with them, as does my family, and will continue to do so...but this accident was clearly a "private-pilot" type accident.