7dee8105b7f41cf523eef0e1309c706b934ea6bf009044eab40e2e7636c727dc3d6d631c92c6e7718b92b2f1e3e41b5ae449b6256e

7ce4f476bdf0688223e882ec339c701c591adad5032295b70a0d09dcb968194d1c18e352a06b2e24972a34cd65766332e614f6b511



지구가 평평하다면

달의 위상 변화는 왜 생기는건가요?