Search / com.cyclecalcs/astronomy
protogridR0· no sign-inRead-only astronomy calculations: sun, moon, planets, eclipses, twilight and star positions.
v1.1.0 · active · website · descriptor JSON · versions
{
"mcpServers": {
"astronomy": {
"type": "http",
"url": "https://www.cyclecalcs.com/mcp",
"headers": {
"Authorization": "Bearer ${ASTRONOMY_TOKEN}"
}
}
}
}claude mcp add --transport http astronomy https://www.cyclecalcs.com/mcp --header "Authorization: Bearer ${ASTRONOMY_TOKEN}"[mcp_servers.astronomy]
url = "https://www.cyclecalcs.com/mcp"
bearer_token_env_var = "ASTRONOMY_TOKEN"
{
"$schema": "https://opencode.ai/config.json",
"mcp": {
"astronomy": {
"type": "remote",
"url": "https://www.cyclecalcs.com/mcp",
"enabled": true,
"headers": {
"Authorization": "Bearer {env:ASTRONOMY_TOKEN}"
}
}
}
}{
"mcpServers": {
"astronomy": {
"type": "http",
"url": "https://www.cyclecalcs.com/mcp",
"headers": {
"Authorization": "Bearer ${ASTRONOMY_TOKEN}"
}
}
},
"deeplink": "cursor://anysphere.cursor-deeplink/mcp/install?name=astronomy&config=eyJ0eXBlIjoiaHR0cCIsInVybCI6Imh0dHBzOi8vd3d3LmN5Y2xlY2FsY3MuY29tL21jcCIsImhlYWRlcnMiOnsiQXV0aG9yaXphdGlvbiI6IkJlYXJlciAke0FTVFJPTk9NWV9UT0tFTn0ifX0%3D"
}{
"servers": {
"astronomy": {
"type": "http",
"url": "https://www.cyclecalcs.com/mcp",
"headers": {
"Authorization": "Bearer ${ASTRONOMY_TOKEN}"
}
}
}
}{
"mcpServers": {
"astronomy": {
"httpUrl": "https://www.cyclecalcs.com/mcp",
"headers": {
"Authorization": "Bearer ${ASTRONOMY_TOKEN}"
}
}
}
}extensions:
"astronomy":
enabled: true
name: "astronomy"
type: streamable_http
uri: "https://www.cyclecalcs.com/mcp"
headers:
"Authorization": "Bearer ${ASTRONOMY_TOKEN}"
timeout: 300
Placeholders to fill from your own secret store: ${ASTRONOMY_TOKEN}. The registry never accepts secret values.
protocol.modernsupports 2026-07-28 (server/discover)protocol.statelessanswers without a sessionprotocol.transportstreamable HTTPprotocol.list_ttltool list is cacheable (ttlMs 86400000)auth.prm, auth.as_metadata, auth.cimdno remote uses OAuthauth.secret_in_urlno templated URLtools.descriptionsevery tool has a descriptiontools.description_length1 tools have descriptions over 1,024 characters, which crowds the contexttools.schemasevery tool has an object input schematools.annotations11 of 11 tools declare readOnlyHint or destructiveHinttools.directory_hintsevery tool declares readOnlyHint, destructiveHint, idempotentHint and openWorldHinttools.token_costabout 8,283 tokens to load every tooltools.api_dumptools are not a one-to-one API dumpstability.changes21 tool changes in 30 daysstability.rug_pullno tool changed its meaning under the same namedeps.known_vulns, deps.mcp_sdk_version, deps.resolvableno npm or PyPI packageastro_find_placechangedannotationsastro_planet_eventschangedannotationsastro_planet_boardchangedannotationsastro_dark_windowchangedannotationsastro_eclipseschangedannotationsastro_rise_setchangedannotationsastro_positionschangedannotationsastro_moon_phaseschangedannotationsastro_moonchangedannotationsastro_sunchangedannotationsShowing the latest 10. Full history: list_changes · trend: quality JSON.
Checks run on what our credential-free, read-only probes observe; tools are never called and no code audit is performed. How it is computed.
+dns-namespace +website +reachable +uptime-100% +updated-20d-ago -no-repository
Derived from observable signals (official registry feed and our own credential-free probes); no code audit performed. How it is computed.
| remote | auth | reachable | uptime 30d | p50 | protocol | last ok |
|---|---|---|---|---|---|---|
https://www.cyclecalcs.com/mcp streamable-http | none | yes | 100% | 404 ms | 2026-07-28, 2025-11-25, 2025-06-18 | 2026-10-20 |
astro_dark_windowread-only | 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. The right tool for "when should I stargaze / photograph the Milky Way / observe deep-sky objects". Location required. For plain twilight times use astro_sun. |
astro_eclipsesread-only | 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. A solar eclipse also carries a computed hybrid flag and, when central, the duration, path width and Sun altitude at greatest eclipse. With a location it adds local circumstances, contact times, and an explicit visible-from-here answer; set visible_only to true to keep only eclipses visible there. include adds the precomputed central path or the circumstances at greatest local eclipse. NOTE: count applies per type, so count=3 with type "both" can return six events. |
astro_find_placeread-only | 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. Results are GeoNames data (CC BY 4.0); the response carries the required credit in its attribution field, which must be preserved when results are shown. Note the other tools accept a place argument directly, so this is only needed to disambiguate a name, filter by country, or reverse-geocode. |
astro_moonread-only | 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. A location adds rise/set and altitude. For a calendar of new and full moons use astro_moon_phases; for the Moon's exact coordinates use astro_positions. |
astro_moon_phasesread-only | 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. Use for "when is the next full moon" and phase calendars. For the Moon's state right now use astro_moon. |
astro_planet_boardread-only | 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. The right tool for "which planets are visible tonight". For exact coordinates of specific bodies use astro_positions. |
astro_planet_eventsread-only | Dated planet events. For Mercury and Venus, the apparition cycle: 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; with no dates it also reports where each is in its cycle right now: morning star or evening star, the conjunctions bounding the current apparition, and the live elongation, phase, magnitude and apparent size. For Mars, Jupiter, Saturn, Uranus and Neptune: conjunction with the Sun, western quadrature, opposition and eastern quadrature, the instants the planet's apparent geocentric ecliptic longitude minus the Sun's reaches 0, 270, 180 and 90 deg, each with the planet's constellation, distance, magnitude and elongation. For any of the seven, constellation_entry, returned only when listed in kinds: each crossing of an IAU constellation boundary, with the two constellations and the direction of motion. The right tool for "when does Venus become the morning star", "when is Mars at opposition", or "when does Uranus cross from Taurus into Gemini". For tonight's visibility of all eight planets use astro_planet_board. Mercury and Venus conjunction instants use the classical heliocentric convention, named on each event. |
astro_positionsread-only | 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. With a location the position is topocentric, but tropical_sign and constellation stay geocentric, and meta.conventions.label_origin says so. Use for "where exactly is X". Do not pass earth. For rise and set TIMES use astro_rise_set; for a visibility overview of all planets use astro_planet_board. |
astro_rise_setread-only | 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. Accepts fixed radec targets. For the Sun specifically, astro_sun returns richer twilight structure; for positions between events use astro_positions. |
astro_sky_todayread-only | 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. Reach for this first when the question is broad, like "what is in the sky tonight". For solar-day detail use astro_sun; for choosing an observing night use astro_dark_window; for one planet's exact position use astro_positions. |
astro_sunread-only | 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. Location required. For a series, send start and end (step is whole days, e.g. "1d" or "7d"). For "is it dark enough to observe" prefer astro_dark_window; for a broad snapshot prefer astro_sky_today. |
Schemas: list_tools.
{
"name": "com.cyclecalcs/astronomy",
"title": "CycleCalcs Astronomy",
"$schema": "https://static.modelcontextprotocol.io/schemas/2025-12-11/server.schema.json",
"remotes": [
{
"url": "https://www.cyclecalcs.com/mcp",
"type": "streamable-http",
"headers": [
{
"name": "Authorization",
"isSecret": true,
"description": "Optional. Without a key, tools work up to 50 calls a day per network address; a key raises the daily limit. Bearer YOUR_KEY, where YOUR_KEY is a CycleCalcs API key from RapidAPI (the Basic plan is free): https://rapidapi.com/info-8KZIhinZ9/api/cyclecalcs-astronomy-api3"
}
]
}
],
"version": "1.1.0",
"websiteUrl": "https://www.cyclecalcs.com/api/mcp.html",
"description": "Read-only astronomy calculations: sun, moon, planets, eclipses, twilight and star positions."
}