Earth 1218 is the designator given to our reality in the Marvel Comics. It is considered a boring world because our world has no superpowered humans.

Earth-1218 Earth-1218 is the designation given to our reality, where super-heroes and other super-powered beings don't physically exist.

Earth-616 Earth-616 is generally referred to as “our” universe. It has become such a Marvel institution that it was borrowed for the title of its upcoming documentary series Marvel's 616, which begins streaming exclusively on Disney+ this week.

Since the multiverse wasn't a thing before Loki, The main MCU timeline was 616 which is basically the sacred timeline (Everything he who remains decided would happen). The moment the main MCU timeline diverged, it became -199999.

Creator Grant Morrison once stated that Earth 33 is "our real world". Earth 33 is based on the Pre-Flashpoint concept of Earth-Prime: an Earth where superheroes only exist in comic books and do not appear in real life. The Multiversity Guidebook confirmed Superboy Prime as an inhabitant of Earth 33.

In the Official Handbook of the Marvel Universe A to Z: Vol. 5, the MCU movies and TV shows are established to take place in a different setting altogether from the comics. To avoid confusion, the handbook designates the comic universe under the Earth-616 title, while the MCU is positioned as Earth-199999.

The moment the main MCU timeline diverged, it became -199999. Which means that the last hour of endgame and everything after that happens in Earth -199999 because it is impossible for No Way Home and Multiverse of Madness to happen on the sacred timeline.

The mainline (comics) universe is 616, from the address of Marvel Comics headquarters. 199999 looks like a date, either the 9th September 1999 or maybe the 99th day of 1999 which is 9th April. Presumably, something significant happened on the date, either in real life or significant to the storyline of the setting.

The moment the main MCU timeline diverged, it became -199999. Which means that the last hour of endgame and everything after that happens in Earth -199999 because it is impossible for No Way Home and Multiverse of Madness to happen on the sacred timeline.

While looking strikingly similar to the main reality of the MCU, known as 616, Earth-838 had some major differences, including waterfalls flowing from skyscrapers, flora growing from rooftops, and a new superhero team in the form of the Illuminati, comprised of representatives from each superpowered team.

We are living on the Earth. The Earth is a planet that orbits the sun and is the third planet from the sun in the solar system. It is a rocky planet that has a solid surface and an atmosphere, and it is the only known place in the universe where life exists.

Earth was a planet of Earth-15. The planet became known as a "dead Earth" following an event in 1986, and radioactive fallout was teleported there in 2018, but any remains of the planet were destroyed during the Anti-Monitor Crisis.