Canberra has around 8-10% of the population of Sydney or Melbourne and 33% that of Adelaide, so at 55km distance, the brightness of the Canberra
light dome is (roughly) equivalent to being about 150km from the Melbourne or Sydney CBD or 90km from the Adelaide CBD. Also, other than Canberra
to the north, there are no other significant towns or cities, in any other direction within 200km of Eagleview, resulting in a dark sky overhead.