General Tools

cyclecalcs.com

Provides astronomical data such as sky snapshots, sun and moon details, and celestial positions for a given location and time.

1 endpoint11 known toolsFirst detected August 12, 2026Last detected August 12, 2026

ENDPOINT 1

https://www.cyclecalcs.com/mcp

No auth detected

MCP server metadata

Name: cyclecalcs-astronomy
Version: 1.0.0

Capabilities

tools

Server instructions

Astronomy calculations from CycleCalcs (cyclecalcs.com): sun and moon times, planet positions and visibility, Mercury and Venus apparition events, eclipses, lunar phases, dark-sky observing windows, and place lookup. Every tool call needs a CycleCalcs API key from RapidAPI sent as "Authorization: Bearer YOUR_KEY" (the Basic plan is free; keys at https://rapidapi.com/info-8KZIhinZ9/api/cyclecalcs-astronomy-api3). Dates are ISO 8601 within 1700-2200. Locations are lat/lon in decimal degrees, or a place name the API resolves itself. Numeric field names carry their units (_deg, _km, _hours, _fraction) and coordinate fields state their frame (equatorial.j2000, ecliptic.true_of_date).

Known tools 11

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.

Inferred read-only

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.

Inferred read-only

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.

Inferred read-only

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.

Inferred read-only

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.

Inferred read-only

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.

Inferred read-only

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.

Inferred read-only

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.

Inferred read-only

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.

Inferred read-only

astro_planet_events

The apparition cycle of the inferior planets as dated events: inferior and superior conjunctions, greatest eastern and western elongations, peak brightness (a Venus-only event: Mercury's brightness peaks behind the Sun where it cannot be seen), and the rare transits across the Sun.

Inferred read-only

astro_find_place

Resolve a place name to coordinates, region, country, IANA timezone and a stable place_id, or reverse-look-up the nearest places to a lat/lon.

Inferred read-only

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.

TRUST AND VERIFICATION EVIDENCE

Trust Data Available

BuiltWith Trust API v2 evidence for cyclecalcs.com was fetched 2026-08-24T05:38:55.452Z.

Trust status Trusted

cyclecalcs.com is assessed as Trusted: Domain runs a meaningful technology spend, consistent with a real business.

Indexed

Evidence is source-attributed and does not guarantee that a third-party server is safe. Risk labels are conservative metadata heuristics.