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Astro Bob

Why It Takes Forever To Get Dark In Summer

6 Jun 2019, 17:16 UTC
Why It Takes Forever To Get Dark In Summer
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I took this photo at 11:15 p.m. June 1 with twilight still lingering in the northern sky. All the tiny “grains” are stars. In summer, the farther north you live the later the sun sets and the longer the twilights. Bob King
This morning I hunted for a too-faint comet and got my first good look at Saturn. I had set the alarm for 2:15. When I finished at 3 a.m. I looked up and saw the pale glow of dawn in Andromeda low in the northeastern sky. Wow, that was quick! Sunrise was still more than 2 hours away, but already the first sign of its coming was plain to the eye.
Twilight comes in three varieties: civil, when there’s enough illumination to clearly see your way around a landscape; nautical, when the horizon at sea becomes too hard to see to navigate and astronomical, when the sky is truly dark without any solar glow. Degrees show how far the sun is below the horizon. TWCarlson
A week ago I caught the other “short end of the stick” when I arrived at my observing site at 11:15 p.m. with the northwestern sky still faintly aglow with twilight. Twilight comes ...

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