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Not all fringe suburbs are equal, the microclimates can be very different.
For a start avoid the low-lying areas which have been heavily farmed in the past because (a) farmed dark soil areas hold water which is a good source for fogs and (b) the low-lying areas trap fog.
Ideally you want to look for a place that is on a ridge (less or no fog) and ideally sandstone/sandy country (ie was more or less native bush) so it won't be fog-prone.
In these respects you can eliminate the whole south/southwestern fringe (Campbelltown), the west this side of Glenbrook (ie Penrith), and the low-lying areas northwest (Blacktown to Richmond).
This leaves Dural and north, which is on a ridge, or the upper north shore which is another long ridge where Killara, Pymble, Turramurra, Hornsby, Berowra are increasingly high.
Then there's light pollution. Personal experience has been that from east Killara, north Turramurra, the northern fringe of Horsnby/Asquith are about as good as it gets unless you are prepared to go a long way further afield.
I live in Killara in a dark street and while its OK its nothing special. You have to go north of Hornsby to see any useful reduction in sky glow.
If I were wanting a home with observatory, and could reduce my work to say 3 days a week i'd move to Blackheath. Much darker.
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