Question

how did the ancient astronomers identify the visible planets from the rest of the stars?​

Answer 1

Answer:

Ancient astronomers were able to differentiate between stars and planets, as stars remain relatively fixed over the centuries while planets will move an appreciable amount during a comparatively short time.

Answer 2

The visible planets were distinguished from the rest of the stars in two ways by ancient astronomers:

1. In comparison to the movement of a star, a planet moves across the sky in a very distinct manner. Without a telescope, this can be seen in days, if not weeks. Planet, which meaning wanderer, was also called that.
2. planet does not twinkle, but a star does. This is because a planet's angular diameter is larger, making it less susceptible to atmospheric dazzling effects.

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