How did the ancient astonomers know the planets were different from the stars?

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The planets move in their own trajectory which is different than the stars in the background. All the stars appear to circle the North star.
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What planet did the ancient Greeks not know about?

The greek Aristotle writted a theorie of the universe based on what Greeks considered geometrical perfect bodies; 5 bodies, then 5 planets: Mercury, Venus, Mars, Jupiter, and

How do you know if your looking at a star or a planet?

2 things separate them visually. First, planets move. You won't see this in one night, but if you watch the object from night to night, you will see that it has moved a sho

How did ancient astronomers know the difference between planets and stars?

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Which planet is one astonomical unit from the sun?

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How do you know that stars have planets?

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How do you know which stars have planets?

What an excellent question. It appears you already realize that if you are talking about stars other than our sun, you are talking about stars that are many lightyears away fr

How scientist know stars have planets?

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What was different about planets and stars in ancient times?

Almost nothing was different, except our understanding of things. The stars have been shining for millions or billions of years; all the planets have been pretty much just whe