- Moment in blue – Paijanne lake in Asikkala, Finland
The Finnish term “blue moment” (sininen hetki or hämäränhyssy) originally described a winter phenomenon that can be observed just after the sun sets. In that moment, sunlight from below the horizon is reflected and scattered in the atmosphere — the scattered light contains predominantly short wavelengths, and thus appears a pale blue. The blue moment is over quite quickly, and can only be seen when atmospheric conditions are exactly right.
Nowadays, the term can be used to describe that elusive moment between dusk and darkness, regardless of the time of year.
Blue Moment 
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