What are constellations and how do they relate to the planets?

Question: What are constellations and how do they relate to the planets?
- Keywords:
  constellation
Asked by anon-335301 on 5 Oct 2022.
- Jack Reid answered on 5 Oct 2022:
  
  Constellations are groups of stars, which appear to form certain shapes, such as Orion, which is taken to resemble the Hunter. Many of the constellations were seen, identified, and named by the Ancient Greeks.
  
  Planets are quite different, and closer to Earth, but can often appear in front of (or ‘in’) constellations, hence discussion like ‘Venus entering Sagittarius’.

Question: What are constellations and how do they relate to the planets?