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In the summer night sky, the stars appear as if they are pinned firmly to the heavens.
In contrast, in the winter night sky, the stars twinkle brightly. ✨

The reason for this difference lies in the behavior of the atmosphere above us.
In astronomy, the way stars appear is called seeing.
On nights when the atmosphere is calm, stars look steady, while on nights with more turbulence, stars seem to flicker.

When the seeing is good, even faint stars can be observed clearly.
But when the seeing is poor, the light wavers and stars sparkle like gems. 💫

In short――
Summer stars are “still,” while winter stars are “sparkling.”
The same starry sky shows a different expression, shaped by the flow of the atmosphere. 🌌