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mcp/harbor
Verified official

Flat Earth Science MCP

v1.0.1

org.flatearthscience/flatearthscience-org

Earth curvature, horizon, flight, Sun and daylight calculators plus tested flat-earth claims.

transport:streamable-http tools:8
View source Website

Target client

run in your project directory 

claude mcp add --transport http flatearthscience-org https://flatearthscience.org/api/mcp

setup guides: Claude Code Claude Desktop Cursor VS Code Zed Windsurf Cline Gemini CLI Grok ChatGPT Claude.ai LangChain

Adds it for this project only. Append --scope user to make it available everywhere. Claude Code docs

calculate_curvature

calculate curvature

get_horizon_distance Read-only

get horizon distance

compare_flat_map_distance

compare flat map distance

get_flight_distance Read-only

get flight distance

get_sun_position Read-only

get sun position

get_daylight_hours Read-only

get daylight hours

compare_true_size

compare true size

find_claims Read-only

find claims

All 8 tools, one page each

1 resource you attach as context

Mutating and Read-only are read off each tool's name, not its schema — a hint, not a guarantee. Check the server's own documentation before granting access.