Rev 12:1 A great and wondrous sign appeared in heaven: a woman clothed with the sun, with the moon under her feet and a crown of twelve stars on her head. 2 She was pregnant and cried out in pain as she was about to give birth.

12:3 Then another sign appeared in heaven: an enormous red dragon with seven heads and ten horns and seven crowns on his heads. 4 His tail swept a third of the stars out of the sky and flung them to the earth. The dragon stood in front of the woman who was about to give birth, so that he might devour her child the moment it was born. 5 She gave birth to a son, a male child, who will rule all the nations with an iron sceptre. And her child was snatched up to God and to his throne. 6 The woman fled into the desert to a place prepared for her by God, where she might be taken care of for 1,260 days.

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It seems pretty obvious to me that the woman is the Earth. clothed in the sun with the moon in her tidal pull. The twelve stars are the constellations of the ecliptic.

Obviously the dragon is some sort of cosmic event.