Since there is some dialogue going about the Moon , I think I should post my thoughts on the Cary Sheet version, which is where many of the details on the Tarot de Marseille originate.
The card needs a bit of study. I want to focus primarily on the center background and what is on the shore of the lake.
I have enlarged that portion on the lower right below.
What I see in the background is a Greco-Roman style temple--but still of the sort built in Egypt along the Nile--flanked by a pair of obelisks which do double duty as plants, if seen from a different perspective. Obelisks generally came in pairs, situated strategically next to temples. Then there is a winding path down to the lake. Egyptian temples frequently had artificial lakes attached to them. Then along the lake, from the center to the right, are what I take to be two crudely drawn crocodiles, the two long things next to the lake, just above it on the card. They might be the equivalents of the dogs in the Tarot de Marseille. Crocodiles of course are associated with Egypt, almost unavoidably. At least one of them is holding something in its mouth. In the Tarot de Marseille II of Conver, rather uniquely, there is a corresponding something in the two big claws of the lobster/crayfish sitting in the lake.
I think the allegory is that of snatching the treasure from the clutches of the dragon. In the story of Isis and Osiris, Isis is continually in search of Osiris's body. First it floats all the way to Lebanon, where she tracks it down and brings it back to Egypt. Then it is hacked into pieces by Typhon and buried in various spots. One piece, the phallus, Isis never recovers because it is eaten by a member of a particular type of fish. Perhaps what the lobster has in its claws, and the crocodiles in their jaws, is the phallus, the generative organ. In any case it is a piece of the body of Osiris, as holy as the body of Christ, or the divine substance of the alchemists. It is also the nutritive minerals that make for abundant crops when spread upon the farmland of the Nile Valley.
Now something else about the Star. Star cards in other decks of this time emphasized the theme of hope, either in this world or the world to come.
The Bolognese early card has three men in Eastern garb, below a star. The Ferrarese card has two men, one pointing up and the other pointing to the left, i.e. west (if the conventions of maps of that time are to be followed).
The minchiate card has a king on a horse following a star.
All these just mentioned (I don't include the Cary-Yale cards above) are all variations on the Three Wisemen or Magi from the East, and the star is the star over Bethlehem, where the hope of humankind is born. In that way they are all different formulations of the theological virtue of Hope, as expressed in not dissimilar imagery in the minchiate version of that minchiate, paralleling similar restructuring from the Cary-Yale to the PMB. The Cary Sheet Star card, interpreted as herald of the Nile flood, represents a different, more specific type of hope, a hope in the regeneration of the land by the flood, but also a hope for the reuniting of the soul, envisioned as Isis, with its twin in the divine world, Osiris, also its King in the world to come.
Then when the flood actually comes, it is a time of potentially destructive torrents followed by stagnant lakes and ponds, breeding grounds for mosquitoes and disease. It is a time of faith that all will be for the best, that the Nile will make it possible for there to be abundant crops, a kind of charity, a freely offered gift of nature. It may well be that Star, Moon, and Sun in this way replace Hope, Faith, and Charity (in that order) of the Cary-Yale on a cosmic level, and raise them to a cosmic level in minchiate (which has both sets).