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Deryck you're a very brave man to try this.
If you can get access to an iPhone I'd suggest download the Emerald Chronometer app and have a look at the "Mauna Kea" face of this (digital) clock for inspiration - it shows moonrise and set, sunrise/set and much more.
The only way to do this IMHO is to have hands where each hand can move independently of the others and have a microprocessor work out where each hand should point, and use stepper motors or shaft encoders to position each hand accordingly - without using old-school geartrains.
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