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I'm not assuming, they literally asked.

I am guessing on age though, mainly because for anyone who grep up when charts was the only thing that existed, this wouldn't be a question.

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I understand maps and charts. But generally, stars stay in the same place, so its easy to put them on a map. I was trying to understand how you put a planet on a map when it keeps moving around

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Planets travel along the ecliptic, so they're pretty easy to map.

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