Earth curvature, horizon, flight, Sun and daylight calculators plus tested flat-earth claims.
Connect Remote server
claude mcp add --transport http flatearthscience-org https://flatearthscience.org/api/mcp
{
"mcpServers": {
"flatearthscience-org": {
"url": "https://flatearthscience.org/api/mcp"
}
}
}
{
"servers": {
"flatearthscience-org": {
"type": "http",
"url": "https://flatearthscience.org/api/mcp"
}
}
}
Settings > Connectors > Add custom connector
URL: https://flatearthscience.org/api/mcp
Tools 8 found in our last check
calculate_curvatureCalculates how much of a distant target the Earth's curvature hides, from the surface distance, the observer's eye height, the target's height and an assumed refraction coefficient. Returns the hidden and visible height, the tangent-plane drop, the horizon distance and dip, the…
get_horizon_distanceGives the distance to the horizon from an eye height above a smooth sphere, and how far a taller object such as a mast stays in straight sight. Returns the observer's horizon distance, the range added by the target height and the maximum shared sightline.
compare_flat_map_distanceCompares the distance between two cities on a north-polar flat-Earth map with their great-circle distance over a sphere. Returns both distances and the factor by which the map stretches or shrinks the pair.
get_flight_distanceCalculates the great-circle distance between two places in kilometres, miles and nautical miles, with the initial and final compass bearings. Each end is one of the website's 20 cities or a latitude and longitude.
get_sun_positionCalculates the Sun's altitude and compass bearing at a place, date and UTC time, with the shadow of a 1 m upright and the day's sunrise and sunset in UTC. A place is one of the website's 20 cities or a latitude and longitude; without a date and time the result is for the current…
get_daylight_hoursCalculates the length of daylight at a place on a date, with sunrise and sunset in UTC, for the UTC day from midnight to midnight. A place is one of the website's 20 cities or a latitude with an optional longitude.
compare_true_sizeShows how much a Mercator map distorts a country's area, from its real area and the latitude it is drawn at. Returns the real area, the area multiplier at the country's own latitude and at a chosen latitude, and the size it appears at each. Covers the nine countries and regions…
find_claimsSearches the website's tested claims and flat-earth investigations, or returns one by id. Each result gives the claim, the verdict, the key evidence and the link to its page; an empty query lists all of them.
Details
| Endpoint | https://flatearthscience.org/api/mcp (Streamable HTTP) |
| First published | 11 Nov 2026 |
| Last updated | 11 Nov 2026 |
| Registry name | org.flatearthscience/flatearthscience-org |
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