usno.astronomy.seasons

Get exact dates and UTC times for vernal equinox, summer solstice, autumnal equinox, and winter solstice for any year. Also includes Earth perihelion and aphelion dates. Source: US Naval Observatory.

SERVERApibase SOURCEapibase-mcp-client

Low RISK CLASS

Category Read

Parameters 10 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/io-github-whiteknightonhorse-apibase/usno.astronomy.seasons.md

WHAT IT DOES

What usno.astronomy.seasons does on Apibase

AI agents call usno.astronomy.seasons to retrieve information from Apibase without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

Parameter	Type	Required	Description
`year`	integer	—	Year for equinoxes and solstices (default: current year)

Parameters from the server's own tool schema.

RISK

Why usno.astronomy.seasons is rated Low

Retrieves astronomical data with no side effects or potential for misuse.

From the tool's definition Get exact dates and UTC times for vernal equinox, summer solstice, autumnal equinox, winter solstice

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs usno.astronomy.seasons safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Apibase, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For usno.astronomy.seasons, this is the rule to start with:

usno.astronomy.seasons Allowed

usno.astronomy.seasons is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "usno.astronomy.seasons": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Apibase, apply this rule, and every usno.astronomy.seasons call is checked against it from then on.

FAQ

Questions about usno.astronomy.seasons

What does the usno.astronomy.seasons tool do? +

Get exact dates and UTC times for vernal equinox, summer solstice, autumnal equinox, and winter solstice for any year. Also includes Earth perihelion and aphelion dates. Source: US Naval Observatory. It is categorised as a Read tool in the Apibase MCP Server, which means it retrieves data without modifying state.

What parameters does usno.astronomy.seasons accept? +

usno.astronomy.seasons accepts 1 parameter: year. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on usno.astronomy.seasons? +

Register the Apibase MCP server in PolicyLayer and add a rule for usno.astronomy.seasons: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Apibase. Nothing to install.

What risk level is usno.astronomy.seasons? +

usno.astronomy.seasons is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit usno.astronomy.seasons? +

Yes. Add a rate_limit block to the usno.astronomy.seasons rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block usno.astronomy.seasons completely? +

Set action: deny in the PolicyLayer policy for usno.astronomy.seasons. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides usno.astronomy.seasons? +

usno.astronomy.seasons is provided by the Apibase MCP server (apibase-mcp-client). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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