# Flat Earth Science

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

- name: org.flatearthscience/flatearthscience-org
- version: 1.0.1
- connection class: R0 (autonomous)
- trust: 96/100
- quality: 89/100 (new)
- owner: not claimed
- descriptor: https://api.protogrid.dev/v1/servers/org.flatearthscience%2Fflatearthscience-org
- tools: https://api.protogrid.dev/v1/servers/org.flatearthscience%2Fflatearthscience-org/tools

**An agent can connect right now, no human step.** Remote endpoint, no authentication, reachable on the last probe.

## Connection (mcpServers)

```json
{
  "mcpServers": {
    "flatearthscience-org": {
      "type": "http",
      "url": "https://flatearthscience.org/api/mcp"
    }
  }
}
```


## Trust

- hygiene: 100
- liveness: 100
- freshness: 100
- provenance: 85
- drivers: +repository +dns-namespace +website +reachable +uptime-100% +updated-2d-ago
- Derived from observable signals (official registry feed and our own credential-free probes); no code audit performed.

## Quality 89/100 (new)

### protocol: 75 (weight 25)

- warn `protocol.modern`: newest supported version is 2025-11-25; 2026-07-28 not supported, older versions are deprecated until 2027-07-28
- n/a `protocol.stateless`: only applies to 2026-07-28 servers
- pass `protocol.transport`: streamable HTTP
- n/a `protocol.list_ttl`: only applies to 2026-07-28 servers

### authorization: n/a (weight 15)

- n/a `auth.prm`, `auth.as_metadata`, `auth.cimd`: no remote uses OAuth
- n/a `auth.secret_in_url`: no templated URL

### tool hygiene: 100 (weight 30)

- pass `tools.descriptions`: every tool has a description
- pass `tools.description_length`: descriptions are concise
- pass `tools.schemas`: every tool has an object input schema
- pass `tools.annotations`: 8 of 8 tools declare readOnlyHint or destructiveHint
- pass `tools.directory_hints`: every tool declares readOnlyHint, destructiveHint, idempotentHint and openWorldHint
- pass `tools.token_cost`: about 2,406 tokens to load every tool
- pass `tools.api_dump`: tools are not a one-to-one API dump
- pass `tools.hidden_text`: no hidden text in tool names, descriptions, schemas or annotations

### stability: n/a (weight 15)

- n/a `stability.changes`, `stability.rug_pull`, `stability.new_links`: tool history recorded for 2 of the 7 days needed

### dependencies: n/a (weight 15)

- n/a `deps.known_vulns`, `deps.mcp_sdk_version`, `deps.resolvable`: no npm or PyPI package

- tools: 8, about 2,406 tokens to load them all
- tool set hash: 6fef120d6e783f1887bc0f057951e272
- badge: [![protogrid quality](https://protogrid.dev/badge/org.flatearthscience/flatearthscience-org.svg)](https://protogrid.dev/servers/org.flatearthscience/flatearthscience-org)
- Checks run on what our credential-free, read-only probes observe; tools are never called and no code audit is performed.

### Tool changes

_No tool definition changes recorded._

## Remotes

- https://flatearthscience.org/api/mcp (streamable-http, auth none, reachable true, uptime30d 1)

## Packages

_none_

## Tools (8)

- `calculate_curvature`: Calculates 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 maximum mutual sight-line range and the midpoint bulge on a smooth sphere of radius 6,371.0084 km.
- `compare_flat_map_distance`: Compares 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.
- `compare_true_size`: Shows 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 in the website's size table.
- `find_claims`: Searches 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.
- `get_daylight_hours`: Calculates 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.
- `get_flight_distance`: Calculates 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_horizon_distance`: Gives 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.
- `get_sun_position`: Calculates 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 moment.