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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They didn’t know they were closer. What they did notice is that almost all the dots in the sky stayed in the same positions relative to each other and the sun. Almost all.
A select few dots changed positions relative to everything else from day to day. Those moving dots are the planets (the word “planet” has it’s origins in a Greek word for “drifting”).
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