Meaning: The planets move together in a way that creates a beautiful and pleasing sight.
Choice of Words: Harmony means a pleasing combination of sounds. Dance together means they move together in a coordinated way.
Alternative Expressions
The dancers move in unison.
Meaning: This sentence is describing how two or more dancers are moving at the same time.
Choice of Words: The word unison means when two or more things happen at the same time. Move means to change your position, and dancers are people who dance. So when we put it all together, it means that two or more dancers are moving at the same time.
Their steps are synchronized.
Meaning: This sentence is describing how two or more dancers are moving their feet at the same time.
Choice of Words: The word synchronized means when two or more things happen at the same time. Steps are the movements you make when you walk or dance, and their refers to the dancers. So when we put it all together, it means that the dancers are moving their feet at the same time.