After a long, cold night there was a silver lining at the horizon. We had nearly no clouds the whole night long, but now at the beginning of the day some clouds were coming up in the sky.
And this was a good thing. Already now you can see a slightly reddish glow at the clouds and this was at the beginning of the blue hour before the sun was rising. If there are no clouds in the sky during the sunrise, the sky is only yellow and the red color is gone when the sun will be visible.
But this time I was to the right time at the right place. Okay, I was the whole night there, but you can still miss the sunrise if you are not watchful.

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