celestial equator
south celestial pole
今天"金星合月",又是"火星冲日",这些天文学知识知道了吗?
天文,科普,基础,双语,知识 北天极 天赤道 南天极 celestial sphere
ecliptic——黄道
Tips:Do Not Provide
Personal Loans: Go Easy On Your Finances
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