You want to get north of the Great Dividing Range as it has a better climate for astro than the south side. There are arguements for the south side in places depending on what it is you want to do. Do you prefer clear skies or better observing skies?
I bought in Heathcote because it takes a little over an hour to get to from the northern suburbs where I live and work. There are considerably more clear nights up there than in Melbourne. It is also at a higher altitude but Melbourne sometimes gets some very good seeing.
On the south side of the Great Divide is Ballarat which means that you’ll get more cloud BUT there are spots of 800-1,000m elevation which can mean better crisper skies than Heathcote at 240m or Melbourne (I’m at 70m).
I do a lot more photography than visual and most of my imaging is wider field stuff which is less seeing dependant. Heathcote works better for me than Ballarat but if i was more interested in planetary photography I’d be inclined to look at Ballarat over Heathcote.
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