Thanks, Tim.
I found the local times in the Jupiter Moon Events tables in the back of ‘Astronomy 2024 Australia’ and augmented them with adjusted UTC times from the Royal Astronomical Society of Canada’s ‘Observer’s Handbook 2024’. I recommend both books if you are interested in this type of detail.
I obtained the local twilight times from the ‘Sky Tonight’ app.
I have since received a copy of ‘Astronomy 2025 Australia’ for Christmas and have found another double act on Monday 6 January that is later at night and may get around some of these twilight issues – a double transit and single shadow at around 10pm.
The AEDT times on Monday 6 January are:
- 8:54pm Io transit ingress
- 9:38pm Io shadow ingress
- 11:06pm Io transit egress
- 11:50pm Io shadow egress
- 9:45pm Ganymede transit ingress
- 11:50pm Ganymede transit egress
- 9:15pm civil twilight begins in Melbourne
- 9:54pm nautical twilight begins in Melbourne
- 10:37pm astronomical twilight begins in Melbourne
Quasar Publishing, Astronomy Australia 2025:
https://quasarastronomy.com.au/product/astronomy-2025/