proper nouns - What is the correct capitalization of the words earth and moon?


I believe that Earth means planet and earth means soil. But I've seen earth used in published works to mean the planet earth. But no one writes jupiter.


Similarly, Moon should mean the name of Earth's moon and lower case moon means the general category. This one is more complicated because I've read that the name of Earth's moon is Luna. Except no one calls it that. We don't say "Neil Armstrong was the first man on Luna."


Am I correct or is this a matter of convention?




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