One Piece Encyclopedia


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Moon Infobox
Japanese Name:
Romanized Name: Tsuki
English Name: Moon
Debut: Chapter 28; Episode 12
Region: Outer space

The Moon is a giant celestial body, a rock-composed sphere, that orbits the world. It is often seen during the night.


Geocentric Model

The Oharan model of the world.

The moon appears throughout the series, but the first time the moon was seen was when Zoro fought Kuina in his childhood flashback.[1] Later Kuro used the moon as a signal to carry out his three-year plan; the sight of a crescent moon makes him uncontrollably murderous.[2][3] During the sequences that influence Kuro, the moon was shown to be a red-orange crescent. In subsequent appearances the moon begins to be hard-sketched.

During Nico Robin's flashback of Ohara, a model of the world with seven satellites (which includes their world's moon) can be seen inside the library of the Tree of Knowledge.[4] The model was destroyed when the Buster Call attack caused the tree to collapse.

Traveling to the moon seems to be considerably easier than in real life, as Enel managed to go there using the Ark Maxim,[5] and the four automata managed to go there traveling in balloons.[6]

Ancient CivilizationEdit


Enel in front of the ancient city Birka.

There is an ancient city on the moon named Birka (ビルカ Biruka?), where technology and architecture were highly advanced. The city's name is the same as Birka, a Sky Island far to the southeast of Skypiea.[7]

From paintings on the walls, some of the city's history is revealed: it was home to the ancestors of Skypieans, Shandorians, and Birkans, but one day they left Birka and headed to the main planet due to lack of resources on their homeland. They left their creations on the moon: the robot-like creatures named automata.[8] It is unknown when their emigration took place, but it was at least 1,100 years ago, since it was at that time that the city of Shandora was prosperous.[9]

The descendants of the citizens who left the moon appear to have forgotten their origins, although the moon, called "Fairy Vearth" and believed to be a place of dreams, remains a folk tale amongst the Birkans. Enel, after studying history within the Upper Yard, came to the belief that the moon is the legendary land that he sought: an endless land of sacred dirt, also known as "Vearth". This is the reason that he constructed the Ark Maxim.[5]

Ancient Drawing of Sky People

The ancient population of Birka.

The city, which was in an underground basement within the moon's surface, has been uninhabited for a long time, and has long since fell into ruin. Despite this, the city retains its advanced look, with the automata being in capsules with inactive electric generators and machinery.[10] The Space Pirates had been digging into the ruins while also warring with the four automata that were created by Dr. Tsukimi.

During his adventures on the moon, after defeating the Space Pirates and gaining the loyalty of the four automata he had rescued from certain death, Enel eventually finds the ruins of Birka, and after reading the murals on the walls, recharges the ancient automata, and decides to settle there.[11][12]

Moons ProgressionsEdit

During the early chapters, it was possible to use the moon to create an estimated time span for Luffy's adventures, presuming the One Piece world's time span is equal to that of Earth's. In some cases, the phase of the moon even gave the chapter its title. Over time, however, this idea seemed to have been retired, and it is no longer possible to use the moon as a time scale.


  • The ancient lunar city, Birka, may have been named after the real-life Birka, a Viking-age trading center in Sweden.


  1. One Piece Manga and Anime - Vol. 1 Chapter 5 and Episode 19. Zoro's flashback shows a full moon while he duels Kuina
  2. One Piece Manga and Anime - Vol. 4 Chapter 28 and Episode 12, Kuro's bloodthirstiness is triggered by a crescent moon.
  3. One Piece Manga and Anime - Vol. 5 Chapter 37 and Episode 15, Kuro's flashback reveals how he murdered all the Marines under a crescent moon.
  4. One Piece Manga and Anime - Vol. 41 Chapter 392 and Episode 275, The model of the world can be seen within the Tree of Knowledge.
  5. 5.0 5.1 One Piece Manga and Anime - Vol. 32 Chapter 300 and Episode 193, A defeated Enel decides to travel to Fairy Vearth, the moon, alone.
  6. One Piece Manga - Vol. 46 Chapter 448, automata created by Tsukimi are revealed to have traveled to the moon by balloon.
  7. One Piece Manga and Anime - Vol. 30 Chapter 279 and Episode 182, Birka is mentioned by McKinley.
  8. One Piece Manga - Vol. 48-49 Chapters 470 and 472 cover pages, Enel reads the murals to learn the history of the Sky People.
  9. One Piece Manga — Vol. 28 Chapter 261, Nico Robin reads about Shandora's history.
  10. One Piece Manga - Vol. 48 Chapters 465-466, Enel finds the inactive ruins of Birka within a cavern.
  11. One Piece Manga - Vol. 48 Chapters 467-470, Enel reactivates the automata.
  12. One Piece Manga - Vol. 49 Chapters 473-474, Enel settles down in Birka.

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