Hi Peter,
There is an observatory at Mudgee. If you head out of Mudgee toward Gulgong, there is a left turn-off about 3km out of town that goes to Hill End (The Hill End Rd). The Honey Haven is at that intersection. Proceeding out about 15km on the Hill End Road, at Gratti, is a turn onto a dirt road (Old Grattai Rd) and Mudgee Observatory is about 500m up that dirt road on the right.
https://mudgeeobservatory.com.au/index.html
The owner is John Vetter -- a good mate of mine (so I am biased)
Best,
L.