I'm a Berowra resident for many years. The sky can be good ocassionally in the early hours of the morning ( I have seen the LMC and SMC clearly ) , but particularly in the warmer months it can be hazy and pretty poor and very subject to Sydney sky glow.
There is a lot of terribly bright unshielded lights just south of me across the valley on the Beaumont Rd Industrial estate in Mt Kuringai , which has just about decimated any chance I have to get dark adapted- I stand in the back yard and I have about 10 shadows . 18 years ago there was almost nothing visible , just a few innocuous lights .
The sky can improve really quickly in a short distance so I would give Cowan a close look - its about 5 minutes down the old pacific hwy and much smaller suburb with next to no commercial development !
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