Why are three-dimensional models useful for understanding the lunar phases?
Answers
Answer:
New moon, quarter moon, full moon are what we call the lunar phases. These are consequences of the motions of the Sun, Earth and moon. Three dimensional models are useful because the face of the moon that catches the light of the Sun depending on their position at any given time could be depicted well. Circular models would be the best visuals for the lunar phases.
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Answer:
It is a rather well-known fact that many school and college students and adults with various degrees of education have difficulties of understanding the moon phases phenomenon. Probably, the best report on that was a documentary made about Harvard University graduates (and even some professors) "A Private Universe".
In my view, the problem is caused mainly by misleading two-dimensional diagrams that are used in school science textbooks that trying to explain the moon phases phenomenon. To assist my own college students (future teachers) to grasp the phenomenon, I tried to find alternative diagrams, reflecting the three-dimensional nature of the moon phases phenomenon, on the Internet using the Google search engine in February 2008. However, after reviewing about 500 first pages, I gave up in my hope to find a 3-dimensional diagram. Here, I present my effort to develop one (I would appreciate anyone who directs me to a better representation).
But, first let me discuss why I so dissatisfy with traditional two-dimensional diagrams of the moon phases explanation. Let consider the following and rather typical 2-dimensional diagram that I found on the Internet:
Typical misleading 2-dim representation of moon phases
Explanation: