How were early astronomers and cultures able to see other planets?

1 Answer
A. S. Adikesavan
Jan 19, 2016
  1. No twinkling of light. from planets. 2. Due to relative motion respect neighboring stars, little or more changes in rising/setting times in the horizon. ..

Explanation:

Seen without telescope, ancient star-gazers recognized Mercury, Venus, Mars and Jupiter as planets. Very-slowly moving (relative to star configuration) Saturn was recognized as planet only later. Uranus and Neptune were post-telescope discoveries.Ref: www.nakedeyeplanets.com

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