TFC Eratosthenes
by trygve55
TFC Eratosthenes reshapes TerraFirmaCraft world generation so the world behaves as a sphere, with the terrain fitted to a Craster Parabolic map projection.
What it does
The mod modifies how TerraFirmaCraft generates terrain so that sailing around the world is possible. A boat or a horse that crosses the 180 meridian, heading west or east, is teleported to the opposite side. Special handling near the poles prevents glitches there, and volcano hotspots are kept from spawning outside the world's edges, so islands do not appear where the map ends.
The mod is named after Eratosthenes, the Greek scholar who estimated Earth's circumference about 240 B.C. at roughly 25,000 miles, an early argument for a spherical planet. It reads the world size from TerraFirmaCraft and uses a temperature scale value during generation. Optional support exists for TFC: Real World with the Equal Earth projection, and for aleki's Nifty Ships and Firma: Civilization, the latter only on 1.20.1. Distant Horizons can be used together with the mod to view the earth at distance. TerraFirmaCraft is required, and the mod needs both the server and the client to install it, with the server required and the client optional.
Key features
Spherical world
Terrain generation is shaped so the world reads as a sphere rather than a flat plane.
Sailing around the world
Boats and horses that cross the 180 meridian are carried to the other side, so routes can circle the globe.
Polar handling
Extra logic near the poles prevents generation and movement glitches in those regions.
Coordinate overlay
An optional client-side overlay shows the current coordinates for players who want them.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Requirements
Dependencies declared by the latest file for each loader.
Required 1
Optional 3
Use cases
Who it’s for: Server owners who run TerraFirmaCraft worlds and want a spherical layout, and players who explore by sea on those servers.
How it compares
TFC Mantle Mountains is open source under the MIT License and runs only on the server, with files for 1.20.1 – 1.21.1. TFC: Real World is licensed under the MIT License, with files for 1.18.2 – 1.21.1, so it covers older versions than Eratosthenes. Eratosthenes itself is open source under the GNU General Public License v3.0 or later and targets 1.20.1 and 1.21.1.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| TFC Eratosthenes | Forge and NeoForge | 1.20.1 – 1.21.1 | Server required, client optional | 2026-08-14 |
| TFC Mantle Mountains | Forge and NeoForge | 1.20.1 – 1.21.1 | Server-side only | 2026-09-15 |
| TFC: Real World | Forge and NeoForge | 1.18.2 – 1.21.1 | Client and server | 2026-10-13 |
Questions
Does TFC Eratosthenes need TerraFirmaCraft?
Must players install TFC Eratosthenes on their own game?
Which game versions does TFC Eratosthenes support?
Does Firma: Civilization work with TFC Eratosthenes?
In the catalog
TFC Eratosthenes is one of 8,515 World generation mods on ModsFinder, and one of 5,058 World generation mods for Forge. 32,366 mods support Minecraft 1.21.1.
Similar mods
What the author says
TFC Eratosthenes ======= In 240 B.C., Greek scholar Eratosthenes calculated the Earth’s circumference to be roughly 25,000 miles, providing early proof of its spherical shape. With modern technology and the amazing world generation in TerraFirmaCraft we are able to recreate this in Minecraft. Answer: It should be…
Official listing
- Modrinth page
- modrinth.com/mod/tfc-eratosthenes
- Owner
- trygve55
- Published
- 2026-02-05
- Updated on Modrinth
- 2026-08-14
- Facts verified
- 2026-10-15