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30th December 2019
03:06pm GMT

These type of clouds form at an altitude of 15,000–25,000 meters (49,000–82,000 ft) and are are best observed during civil twilight (the period after sunset or before sunrise ending) when the sun is between one and six degrees below the horizon.
Take a look at an example of these types of clouds seen in Norway here: https://www.youtube.com/watch?v=FH8Q2ezwNlE Clip via Steinar Midtskogen Pretty damn cool, right?It is said that these clouds are "very rare" at these latitudes and can only be seen every few years.
Nacreous clouds are made with a mixture of supercooled water, ice crystals and nitric acid. And like we said, they look class. Here's hoping we get to see some.