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

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Ancient astronomers can tell the difference the same way you can tell now - the planets move, while the stars stay in the same patterns. The word "planet" comes from the Greek word for "wanderer". The 'planets' were the lights in the sky that moved. Originally the Greeks included the Sun and Moon as planets, because they were light's that moved through the sky. Also, the closer and bigger planets, Jupiter, Mars & Venus are also MUCH brighter than stars. The smaller planets and the ones that are far, far away (Mercury & Saturn) are also bright - but not much brighter than the brightest stars in the sky. They also all travel in the same narrow path in the sky - the ecliptic. It's the same path the sun & moon follow in the sky through the months & year. These 7 lights were visible in the sky without telescopes - Sun, Moon, Mars, Mercury, Jupiter, Venus & Saturn - which is how we got our 7 days of the week.
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