例文 月は地球の周りを公転しているために、相を有するように見える。
私案 The moon moves in orbit around the earth. It seems to cause a phase.
The moon goes around the earth, which causes to look like a phase.
The revolution around the earth causes the moon to seem to have a phase.
参考訳 The revolution of the moon around the earth causes the moon to appear to have phases.