Sky

I understand that appearance depends on a person’s vision (because an eagle sees a mouse in the grass 2 km away, he has a different perception: a hungry person does not understand a well-fed one – this sense has atrophied in a person). (Noctilucent) clouds are visible depending on the lighting and perception by the human eye: a view in the evening of the same sky with a break of a couple of minutes – in the last picture the clouds are not visible. The same is true at night (when the sky is well illuminated by the Moon): what a person sees well appears poorly in photographs – photographic technology is poorly suited for perception by the human eye. Of course, this is all conditional, because perception also depends on the height at which the clouds are located and the purity of the air (in Crimea, the air is always clean and the sky is clearly visible, especially at night). Actually, I studied physics for many years, so I remembered and generalized.