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MCP live MCP 2026-07-28 streamable-http

io.github.cyanheads/astronomy-mcp-server

io.github.cyanheads/astronomy-mcp-server

Offline observational astronomy: positions, rise/set, moon phases, eclipses, and seasons.

Uptime
100.0%
1 direct probes · 30d
Response
778ms
last probe
Tools
7
callable
Resources
10
readable
Prompts
1
available
Primary URL
https://astronomy.caseyjhand.com/mcp

Tools · 7

astronomy_get_sky_position

Compute the apparent topocentric position of one solar-system body (sun, moon, mercury through neptune, pluto) or a named bright star for an observer location and instant. Returns equatorial (RA/Dec),…

astronomy_get_rise_set

Compute rise, set, and culmination (transit) times for a body at an observer location, plus the maximum altitude at culmination. For the Sun, also returns the three twilight pairs (civil −6°, nautical…

astronomy_get_moon_phase

Report the Moon phase for an instant: illuminated fraction, phase name, synodic age in days since the new moon, phase angle, and the next four quarter phases (new, first quarter, full, last quarter) w…

astronomy_find_events

Search forward from a start time for the next occurrences of one sky-event class, selected by the `event` enum: solar_eclipse, lunar_eclipse, equinox, solstice, moon_quarter, opposition, conjunction, …

astronomy_list_visible

The one-call "what is up right now" answer. For an observer location and instant, iterate every naked-eye solar-system body (and, with include_stars, the bundled bright stars), compute altitude and az…

astronomy_get_ephemeris

Fetch a time-series ephemeris for a small body (asteroid or comet) or spacecraft from JPL Horizons — RA/Dec, distance, and apparent magnitude over a span, optionally with observer-relative altitude/az…

astronomy_get_satellite_passes

Predict visible passes of a satellite (e.g. the ISS, NORAD 25544) over an observer in the next `days`. Identify the satellite by exactly one of `norad_id` or `name` — supplying both, or neither, is re…

Resources · 10

Sun

Static reference card for a solar-system body: canonical name, type (star/planet/moon/dwarf), mean radius in kilometers, and whether it is naked-eye visible. `{body}` must be one of the closed enum va…

astronomy://body/sun
Moon

Static reference card for a solar-system body: canonical name, type (star/planet/moon/dwarf), mean radius in kilometers, and whether it is naked-eye visible. `{body}` must be one of the closed enum va…

astronomy://body/moon
Mercury

Static reference card for a solar-system body: canonical name, type (star/planet/moon/dwarf), mean radius in kilometers, and whether it is naked-eye visible. `{body}` must be one of the closed enum va…

astronomy://body/mercury
Venus

Static reference card for a solar-system body: canonical name, type (star/planet/moon/dwarf), mean radius in kilometers, and whether it is naked-eye visible. `{body}` must be one of the closed enum va…

astronomy://body/venus
Mars

Static reference card for a solar-system body: canonical name, type (star/planet/moon/dwarf), mean radius in kilometers, and whether it is naked-eye visible. `{body}` must be one of the closed enum va…

astronomy://body/mars
Jupiter

Static reference card for a solar-system body: canonical name, type (star/planet/moon/dwarf), mean radius in kilometers, and whether it is naked-eye visible. `{body}` must be one of the closed enum va…

astronomy://body/jupiter
Saturn

Static reference card for a solar-system body: canonical name, type (star/planet/moon/dwarf), mean radius in kilometers, and whether it is naked-eye visible. `{body}` must be one of the closed enum va…

astronomy://body/saturn
Uranus

Static reference card for a solar-system body: canonical name, type (star/planet/moon/dwarf), mean radius in kilometers, and whether it is naked-eye visible. `{body}` must be one of the closed enum va…

astronomy://body/uranus
Neptune

Static reference card for a solar-system body: canonical name, type (star/planet/moon/dwarf), mean radius in kilometers, and whether it is naked-eye visible. `{body}` must be one of the closed enum va…

astronomy://body/neptune
Pluto

Static reference card for a solar-system body: canonical name, type (star/planet/moon/dwarf), mean radius in kilometers, and whether it is naked-eye visible. `{body}` must be one of the closed enum va…

astronomy://body/pluto

Prompts · 1

astronomy_stargazing_plan

Structure a "plan tonight's stargazing from <place>" workflow: resolve coordinates, find the dark-sky window, check the moon, list what is up, and fold in cloud cover. Emits a message that chains the …

How to use

Add to your Claude Desktop / Cursor / Cline MCP config:

{
  "mcpServers": {
    "io.github.cyanheads/astronomy-mcp-server": {
      "url": "https://astronomy.caseyjhand.com/mcp",
      "transport": "streamable-http"
    }
  }
}