The end of Astronomical Twilight (dusk) is defined as the moment the center of the sun is 18° below the horizon. At that time "Night" has officially begun. Yesterday that moment occurred at 8:43 pm MDT and that is when the following sequence of images commenced.
Equipment: Olympus E-M1iii + Leica 15mm f/1.7 + Hoya Sparkle-6 filter.
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| Arcturus over Bristol Head. |
In spite of being officially "Night", the camera still picks up a pink twilight glow. There are reports of northern lights visible in Colorado last night (15 Sep), but this is a westerly view. Looking north, the pink glow merges with some green airglow. Sky brightness was a mediocre sqml=21.25.
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| View to the north. |
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| View to the south. |
It may look like the neighbor's yard is lit up like a stadium, but that is just interior light spilling out and showing up on a long exposure (40 sec).
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| The Summer Triangle. |
The Summer Triangle (Altair, Deneb, Vega) was directly overhead.
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