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Alex,
To compare the darkness of Hargraves vs Katoomba... I'd do it with a camera like my little LX3 taking 2 wideangle shots of the sky horizon to zenith, for 1 min at f/2 at each site. The difference in sky brightness should be readily apparent on the camera.
Might be a good opportunity to use my panorama head on the tripod and make some complete 360's or stitch as a cubic VR... Hmm.
Anyway I'm very glad I went last week as tomorrow night will be clouded out for sure.
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