If I look into the sky and I see two yellow dots it’s all stars for me. Then I hear one of them is mars and I’m like „ok, still looks the same“. How did the people hundred of years ago discover what’s a close planet and what’s a far away star?
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When you look up at the night sky, you give it a casual glance at best, and you look for a few moments and then go back inside or walk somewhere else.
Hundreds of years ago, they stared at stars for hours and noticed which ones twinkled differently and moved around over the course of days/weeks/months. You and I don’t notice that because we’re just not looking for it.
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