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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Go work the night shift at an outdoor job. You will quickly notice that every star is not just a star. People spent much more time outside and in darkness in ancient times than we do, so they had plenty of opportunity to observe the differences in the night sky.
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