INDIVIDUAL MCP TOOL

astro_dark_window

The genuinely dark, moonless observing window for a night: astronomical night intersected with the Moon being down, ranked across up to 62 nights with a trend.

cyclecalcs.comnone authenticationAvailability not checked

LIVE ENDPOINT

https://www.cyclecalcs.com/mcp

No auth detected

Connect to this endpoint to inspect the live schema for astro_dark_window and invoke it with your own arguments.

Indexed input schema

{}

Risk classification

Inferred read-only · medium confidence · heuristic, not a guarantee.

No write-capable action terms were found; this is not proof that invocation has no side effects.

Parent server

cyclecalcs.com

CONNECT WITH APPROVAL

Client installation

Review this server and its permissions before adding it. Secret placeholders must be set locally.

Codex

~/.codex/config.toml

[mcp_servers.cyclecalcs-astronomy]
url = "https://www.cyclecalcs.com/mcp"
enabled = true

Claude Code

.mcp.json

{
  "mcpServers": {
    "cyclecalcs-astronomy": {
      "type": "http",
      "url": "https://www.cyclecalcs.com/mcp"
    }
  }
}

Claude Desktop

Settings → Connectors → Add custom connector

Name: cyclecalcs-astronomy
Remote MCP URL: https://www.cyclecalcs.com/mcp

Add this remote URL as a custom connector in Claude Desktop. Availability depends on the user plan and workspace policy.

Cursor

.cursor/mcp.json

{
  "mcpServers": {
    "cyclecalcs-astronomy": {
      "url": "https://www.cyclecalcs.com/mcp"
    }
  }
}

Visual Studio Code

.vscode/mcp.json

Add to Visual Studio Code

{
  "servers": {
    "cyclecalcs-astronomy": {
      "type": "http",
      "url": "https://www.cyclecalcs.com/mcp"
    }
  }
}

Generic MCP

Client-specific MCP configuration

{
  "name": "cyclecalcs-astronomy",
  "transport": "streamable-http",
  "url": "https://www.cyclecalcs.com/mcp"
}

MCP Inspector

Run the official MCP Inspector locally and enter the indexed Streamable HTTP endpoint.

Related tools

astro_sky_today — One-call snapshot of the whole sky for a place and moment: moon phase and illumination, which planets are up and worth looking at, the next eclipse, and (with a location) sun times.
astro_sun — The complete solar day for one location: sunrise, sunset, solar noon, day length, civil, nautical and astronomical twilight boundaries, and explicit polar day/night status at high latitudes.
astro_moon — The Moon at an instant or as a daily series: phase name and angle, illuminated fraction, distance, apparent size, libration, bright limb, and the next quarter phases.
astro_moon_phases — Every new moon, quarter and full moon in a window (or the next few from a date): each with its exact instant, distance, apparent size, supermoon classification under both competing definitions, traditional full-moon name, and any eclipse falling on it.
astro_positions — Exact positions for up to 20 bodies at an instant or over a time grid: right ascension and declination in both J2000 and of-date frames, ecliptic longitude and latitude, distance, and, with a location, altitude and azimuth with refraction stated per field.
astro_rise_set — Rise, upper transit, set and lower transit for one body at one location, with an explicit status at extreme latitudes (circumpolar, never rises) instead of missing values.
astro_eclipses — Solar and lunar eclipses: the next or previous from a date, or all in a range, with type, magnitude, obscuration, Saros series and global geometry.
astro_planet_board — All eight planets in one call for a date and optional location: constellation, magnitude, apparent size, elongation from the Sun, morning or evening sky, retrograde state with the next station, rise/set, and a worth-looking-tonight assessment.