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Australia mainland: Melbourne. Island: Hobart.
NZ: Invercargill.
All locations too close to the equator. You need to be at least at 48°33 South to be in permanent astronomical twilight. The only Australian location that would qualify is Macquarie Island at about 54th South.
For New Zealand its the Auckland Islands (50-51 South) and even better Campbell Island at 52.5° South.
Antipode Island would qualify too though at 49°40 South it would be hardly visible i think.
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Here at 33° north, on our longest day, astronomical twilight ends around 9:15pm and doesn't start again until 3:45am the next morning, so that is 6 1/2 hrs of "pure night" on our shortest night of the year
Here at 33° north, on our longest day, astronomical twilight ends around 9:15pm and doesn't start again until 3:45am the next morning, so that is 6 1/2 hrs of "pure night" on our shortest night of the year
Meanwhile at Eureka, Nunavut, the sun beats down all night in May only for overnight lows to average -13.3 C...
Here it is a firm nautical twilight situation. The sky is dark blue for two-three hours at midnight and then distinguishable civil twilight kicks in at say 2:40? (1:40 solar time).
My guess would be for a faint rim of brighter sky you'd have to be about 54 degrees North or South. There are plenty of locations in the world at or above 54 North, but as far as 54 South, I believe outside of Antarctica and a handful of islands below New Zealand and Australia only the southern tip of Chile and Argentina near the Strait of Magellan would be at 54 South or greater. As for the lower 48, I know due to time zone boundaries, North Dakota west of Bismarck and just east of the Central/Rocky Mountain Time Zone Boundary have sunsets at 10:15-10:20pm in late June, meaning that nautical twilight would last until about 11:30pm. The UP of Michigan around Marquette also has a sunset in June pretty close to 10:00pm meaning twlight lasts until about 11:00pm. Those are the two closest areas in the Lower 48 I can think of that would have abnormally late twilight in the summer.
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