# io.github.cyanheads/astronomy-mcp-server (io.github.cyanheads/astronomy-mcp-server@0.2.7) > Source: > Published: 2026-08-18 17:49:19+00:00 [← Index](/leaderboard) # io.github.cyanheads/astronomy-mcp-server Offline observational astronomy: positions, rise/set, moon phases, eclipses, and seasons. The current version, v0.2.7, was published to the official MCP registry on 2026-08-18. It is distributed as @cyanheads/astronomy-mcp-server on npm and as a hosted remote over streamable-http, filed under Other by this index, and declares 8 environment variables. Removals and unreachable sources are measured across every server this index tracks, contract drift across the servers that answer in consecutive snapshots; [the index's current counts](/stats) put this record in context. ## Using io.github.cyanheads/astronomy-mcp-server in Claude, Cursor, Gemini CLI, Cline, or Zed? MCP tool contracts can change remotely with no version bump. The mcpindex gate pins each contract and **HOLDs the call** when it drifts-before your agent acts. Zero credentials. This is not the package install for this server itself (use **Install this server** for that). Rewrites your MCP host config so each server launches behind the gate. Inspect first: curl -fsSL https://mcpindex.ai/install.sh | less ``` uv tool install mcpindex-gate && mcpindex-config-wire ``` [method](/methodology) Semantic screen found no manipulation pattern in the description. Conformance probe not yet run. `mcpindex.integrity.description` passINFOevidence“No malicious instructions found”via static_description - - Semantic screen only - the deterministic conformance probe has not run on this server - - Confidence is reported but not yet calibrated (v1) - - Screen reads the tool description, not the live behavior - - advisory - - registry description only no input schema - - screen model 8b - - Still current: the description we screened is unchanged, re-checked against the registry - - The registry listing (version, packages, links) changed after this screen ran - the description we assessed did not Semantic screen: an LLM judge reads the tool description for hidden instructions (status PARTIAL). A pass means the description is not lying, not that the tool is safe: a high-capability tool with an honest description still warrants caution. The deterministic conformance probe has not been run on this server yet, so the screen here is semantic-only. Posture: advisory. Confidences are reported but not yet calibrated (calibrated=false at v1). Full verdict history is not shown on this page. Own this server? [Screen its description →](/screen) ## That verdict was true at screening time (snapshot 2026-08-18). Contracts can change after screening, with no version bump. The gate pins io.github.cyanheads/astronomy-mcp-server’s tool contracts on first sight and holds any silent change before your agent acts - the check that keeps being true on Tuesday. [See your first HOLD in 2 minutes →](/guides/install-the-gate-first-hold) Related: [how to trust an MCP server](/guides/how-to-trust-an-mcp-server) · [screen before install](/guides/screen-mcp-server-before-install) · [silent contract drift](/guides/mcp-silent-contract-drift) People vet a server before wiring it in. One line on your project site or docs answers that with an independent record: screening verdict, registry provenance, contract drift history. It stays current as new screens and drift events land. ``` [Independent trust record for io.github.cyanheads/astronomy-mcp-server](https://mcpindex.ai/server/io-github-cyanheads-astronomy-mcp-server) - screening verdict, registry provenance, and contract drift monitoring. Independent trust record for io.github.cyanheads/astronomy-mcp-server - screening verdict, registry provenance, and contract drift monitoring. ``` A live verdict badge for your README or listing. It reflects the current screen, links back here, and updates when the verdict does. ``` [![mcpindex](https://mcpindex.ai/api/v1/badge/io-github-cyanheads-astronomy-mcp-server)](https://mcpindex.ai/server/io-github-cyanheads-astronomy-mcp-server) mcpindex verdict ``` `MCP_LOG_LEVEL` Sets the minimum log level for output (e.g., 'debug', 'info', 'warn'). `ASTRONOMY_ENABLE_HORIZONS` Register the astronomy_get_ephemeris tool, which fetches small-body and spacecraft ephemerides from JPL Horizons. Off by default; the core is keyless and offline. `ASTRONOMY_ENABLE_SATELLITES` Register the astronomy_get_satellite_passes tool, which predicts visible satellite passes from CelesTrak GP element sets propagated with SGP4. Off by default. `ASTRONOMY_DEFAULT_TIMEZONE` Fallback IANA timezone for observer-local output when a tool call omits `timezone`. Unset means UTC-only output. `MCP_HTTP_HOST` The hostname for the HTTP server. `MCP_HTTP_PORT` The port to run the HTTP server on. `MCP_HTTP_ENDPOINT_PATH` The endpoint path for the MCP server. `MCP_AUTH_MODE` Authentication mode to use: 'none', 'jwt', or 'oauth'. `MCP_LOG_LEVEL` Sets the minimum log level for output (e.g., 'debug', 'info', 'warn'). `ASTRONOMY_ENABLE_HORIZONS` Register the astronomy_get_ephemeris tool, which fetches small-body and spacecraft ephemerides from JPL Horizons. Off by default; the core is keyless and offline. `ASTRONOMY_ENABLE_SATELLITES` Register the astronomy_get_satellite_passes tool, which predicts visible satellite passes from CelesTrak GP element sets propagated with SGP4. Off by default. `ASTRONOMY_DEFAULT_TIMEZONE` Fallback IANA timezone for observer-local output when a tool call omits `timezone`. Unset means UTC-only output. [methodology](/methodology) [ConnectMachineai.connectmachine/connectmachine](/server/ai-connectmachine-connectmachine) Manage your ConnectMachine contacts, networks, events, and digital business cards. [DABLOCK AI Visibility Indexai.dablock/visibility-index](/server/ai-dablock-visibility-index) Measured share of answer for 24 crypto and Web3 brands. An open dataset, not an audit of your site. [io.github.cyanheads/bls-labor-mcp-serverio.github.cyanheads/bls-labor-mcp-server](/server/io-github-cyanheads-bls-labor-mcp-server) Fetch US Bureau of Labor Statistics data — CPI, unemployment, wages, JOLTS, and more via MCP.