What does it mean to spy on the sky with salt?

1, "salt looks up to the sky" is to judge whether there is a storm by using whether salt makes a sound in the fire. Whether the salt block makes sound in the fire is related to the air humidity. If a storm is coming, the humidity of the salt will become high, and the salt will be wet, so there will be no sound when thrown into the fire.

2. The story of "salt looking up to the sky": the elders led the villagers to travel day and night, and they had to transport the salt to a certain place and replace it with barley for the winter. That night, they camped in the wilderness and the stars shone. The elders used the method handed down by their ancestors to take out three pieces of salt and throw them into the campfire to predict the weather changes in the mountains. Everyone is waiting for the old man's "weather forecast": if you hear the "click" sound of salt in the fire, it is a sign of good weather; If there is no sound, it means that the weather is about to get worse and the wind and rain will come at any time. The elderly look serious because salt has no sound in the fire. He thought it was unlucky and advocated that it should be done immediately after dawn. However, another young man in the clan thinks that "peeping at the sky with salt" is superstition and opposes leaving in a hurry. Who knows that the next afternoon, as expected, the situation changed suddenly, and young people were in awe of the ancient wisdom of their ancestors.