The CycleCalcs Astronomy MCP server,
connected in one click.
Astronomy: sun, moon, planet, eclipse, twilight and star position calculations. Connect the official CycleCalcs Astronomy MCP server to Claude, ChatGPT, or Cursor through gate — one gateway URL, no config files, security-checked.
Free to start · No credit card · No hosting needed
Add CycleCalcs Astronomy to your AI in one minute
Pick your client. Copy, paste, done — or let gate handle sign-ins and policies for you.
claude mcp add --transport http cyclecalcs-astronomy https://www.cyclecalcs.com/mcpRun in your terminal, then restart Claude Code.
CycleCalcs Astronomy · https://www.cyclecalcs.com/mcp
What your AI can do with CycleCalcs Astronomy
Real prompts you can type the moment it's connected — no setup, no docs to read.
“Use “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.”
“Use “astro_sun”: The complete solar day for one location: sunrise, sunset, solar noon, day length, civil, nautical and astronomical twilight boundaries, and.”
“Use “astro_moon”: The Moon at an instant or as a daily series: phase name and angle, illuminated fraction, distance, apparent size, libration, bright limb, an.”
“Use “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, super.”
How secure is the CycleCalcs Astronomy MCP server?
Every server in the gate directory has to pass the same four checks before your AI can touch it. Here's how CycleCalcs Astronomy holds up.
Official endpoint
Operated by CycleCalcs Astronomy (cyclecalcs.com) at its documented MCP endpoint — not a third-party mirror or community re-host.
No sign-in needed
This server only exposes public data — no account and no credentials are involved when you connect.
Scanned before it goes live
gate checks every tool for prompt injection, hidden instructions, data-exfiltration hints, and over-broad permissions before the server is available through your gateway.
Watched for drift
If CycleCalcs Astronomy adds or changes tools later, gate re-scans and alerts you — before your AI acts on the change.
Connected in three steps
Connect your gate
Add one gateway URL to Claude, ChatGPT, or any MCP client. One-time setup, about two minutes.
Pick CycleCalcs Astronomy
Choose CycleCalcs Astronomy in the gate directory. No sign-in needed.
Use it anywhere
CycleCalcs Astronomy's tools are live in every AI client you've connected — with rules and logging built in.
Free to start · No credit card · No hosting needed
The actual tools CycleCalcs Astronomy exposes
Fetched live from the official endpoint and re-checked daily by gate — not marketing copy.
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
astro_sun — The complete solar day for one location: sunrise, sunset, solar noon, day length, civil, nautical and astronomical twilight boundaries, and
astro_moon — The Moon at an instant or as a daily series: phase name and angle, illuminated fraction, distance, apparent size, libration, bright limb, an
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, super
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, ecl
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 ri
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 ge
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 n
+ 3 more tools once connected
Who runs the CycleCalcs Astronomy MCP server?
The CycleCalcs Astronomy MCP server at a glance
https://www.cyclecalcs.com/mcpQuestions, answered
Is there an official CycleCalcs Astronomy MCP server?
Yes — CycleCalcs Astronomy operates its own remote MCP server at www.cyclecalcs.com. gate connects you to that official endpoint and adds security scanning, per-tool access rules, and an activity log on top.
How do I connect CycleCalcs Astronomy to Claude or ChatGPT?
Add gate's gateway URL to your AI client once, then pick CycleCalcs Astronomy in the directory. No account or sign-in is needed. From then on, CycleCalcs Astronomy's tools are available in every client you've connected to gate.
Do I need to host anything?
No. CycleCalcs Astronomy runs the server, and gate is fully managed. You just connect one URL — there's nothing to install, deploy, or maintain.
Is the CycleCalcs Astronomy MCP server safe to connect?
It's the vendor's official endpoint, and gate scans its tools for prompt injection and hidden instructions before it goes live, re-checks it whenever it changes, and lets you allow, block, or require approval for every single tool.
Is it free?
Yes — you can get started with gate for free and connect CycleCalcs Astronomy in minutes. No credit card required.
Connect more than just CycleCalcs Astronomy
Every server below works through the same gateway URL — connect once, add tools anytime.
Squarespace DomainsDesignView →Set up CycleCalcs Astronomy in: Claude · Claude Code · ChatGPT · Cursor · VS Code
Give your AI CycleCalcs Astronomy — safely.
One URL. All MCPs. Full control. Free to start.
Get started free