Phil I am just South of Christchurch which puts me pretty close to the same as Southern Tassie. The sunset here is around 9.30.
I have taken two shots only as record shots of time. The first was taken at 9.45pm tonight and the other at 10:05 pm tonight. All that's really visable is the moon and venus. actually the moon was visable for most of the day anyway.
We have daylight savings here and I guess you do too. But if not it would make a difference.
Matty, like you I like winter only for the extra viewing time it gives.
Cheers
Gary