https://www.instagram.com/p/Bfj2JMsF73O/?utm_source=ig_embed
Residents of Russia’s ‘Venice of the north’ awoke early on Saturday morning to find the skyline glittering with strange colors. Yellow, red, blue and green laser-looking columns were visible across the city. At first, people thought that they were witnessing the northern lights, but the pattern of the luminescence suggested a different phenomenon.
The beauty, witnessed and admired by thousands, was in fact a rare atmospheric optical phenomenon caused by the freezing temperatures. Called a ‘light pillar’, the bright occurrence is caused by the interaction of light with ice crystals that are densely packed in the atmosphere of the cold air. With thermometers hovering around -20 Celsius (9 Fahrenheit) this time of the year, the light show is likely to come back to St. Petersburg
https://www.rt.com/news/419778-light-pillars-russia-petersburg/
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