# sun_times

Compute sunrise, sunset, solar noon, and civil twilight for any latitude/longitude on a given date. Times are computed in code from the standard NOAA solar-position equations (no third-party API is called, so the result is dependency-free and resale-safe). Times are returned in UTC by default; pass tz_offset (hours from UTC, e.g. -7 for US Pacific Daylight Time) to shift the output to local clock time. Polar day and polar night are reported when the sun does not rise or set. Use it for daylight planning, photography golden-hour timing, or agriculture and energy calculations.

Agent View of the PolicyLayer registry record for `sun_times`. HTML page: https://policylayer.com/tools/io-github-blackboxfoundry-livedatalink/sun-times

## Facts

- Tool: `sun_times`
- Server: Livedatalink (`https://livedatalink.ai/mcp`) — https://policylayer.com/tools/io-github-blackboxfoundry-livedatalink.md
- Homepage: https://github.com/blackboxfoundry/livedatalink
- Risk category: Write (Medium risk)
- Registry record: grade F, identity unverified
- Server auth posture: open
- Server CORS policy: *
- Server rate-limited: no
- Parameters: 4 (2 required)
- Recommended policy verdict: Rate-limited

## Parameters

| Parameter | Type | Required | Description |
| --- | --- | --- | --- |
| `lat` | number | yes | Latitude in decimal degrees (positive north). |
| `lon` | number | yes | Longitude in decimal degrees (negative west). |
| `date` | string | no | Date, 'YYYY-MM-DD'. Defaults to today (UTC). |
| `tz_offset` | number | no | Hours from UTC applied to output times, e.g. -7 for US Pacific Daylight Time. Default 0 (UTC). |

Parameters from the server's own tool schema.

## Example call (MCP tools/call, JSON-RPC 2.0)

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "sun_times",
    "arguments": {
      "lat": 0,
      "lon": 0
    }
  }
}
```

## Why sun_times is rated Medium

An AI agent can call sun_times faster than any human can review: one bad instruction and it creates or modifies resources in Livedatalink by the hundred, each call as confident as the last.

## Use case

AI agents use sun_times to create or update resources in Livedatalink, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Livedatalink environment.

## Recommended policy (PolicyLayer)

Verdict: **Rate-limited**. Enforced by the PolicyLayer MCP gateway (https://policylayer.com/mcp-gateway) before a call reaches Livedatalink:

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "sun_times": {
      "limits": [
        {
          "counter": "sun_times_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}
```

## Other tools on Livedatalink (289)

- `beneficial_owner_screen` — Destructive — https://policylayer.com/tools/io-github-blackboxfoundry-livedatalink/beneficial-owner-screen.md
- `clinical_site_selector` — Execute — https://policylayer.com/tools/io-github-blackboxfoundry-livedatalink/clinical-site-selector.md
- `edgar_recent_filings` — Execute — https://policylayer.com/tools/io-github-blackboxfoundry-livedatalink/edgar-recent-filings.md
- `entity_dossier` — Execute — https://policylayer.com/tools/io-github-blackboxfoundry-livedatalink/entity-dossier.md
- `patent_recent` — Execute — https://policylayer.com/tools/io-github-blackboxfoundry-livedatalink/patent-recent.md
- `trials_details` — Execute — https://policylayer.com/tools/io-github-blackboxfoundry-livedatalink/trials-details.md
- `air_quality` — Read — https://policylayer.com/tools/io-github-blackboxfoundry-livedatalink/air-quality.md
- `bank_health_report` — Read — https://policylayer.com/tools/io-github-blackboxfoundry-livedatalink/bank-health-report.md
- `bls_indicator` — Read — https://policylayer.com/tools/io-github-blackboxfoundry-livedatalink/bls-indicator.md
- `bls_series` — Read — https://policylayer.com/tools/io-github-blackboxfoundry-livedatalink/bls-series.md
- `book_details` — Read — https://policylayer.com/tools/io-github-blackboxfoundry-livedatalink/book-details.md
- `book_fulltext_search` — Read — https://policylayer.com/tools/io-github-blackboxfoundry-livedatalink/book-fulltext-search.md
- `book_get_text` — Read — https://policylayer.com/tools/io-github-blackboxfoundry-livedatalink/book-get-text.md
- `book_search` — Read — https://policylayer.com/tools/io-github-blackboxfoundry-livedatalink/book-search.md
- `book_status` — Read — https://policylayer.com/tools/io-github-blackboxfoundry-livedatalink/book-status.md
- `bounce_scanner` — Read — https://policylayer.com/tools/io-github-blackboxfoundry-livedatalink/bounce-scanner.md
- `candlestick_signals` — Read — https://policylayer.com/tools/io-github-blackboxfoundry-livedatalink/candlestick-signals.md
- `cargo_crate` — Read — https://policylayer.com/tools/io-github-blackboxfoundry-livedatalink/cargo-crate.md
- `carrier_monitor_recheck` — Read — https://policylayer.com/tools/io-github-blackboxfoundry-livedatalink/carrier-monitor-recheck.md
- `carrier_vetting_batch` — Read — https://policylayer.com/tools/io-github-blackboxfoundry-livedatalink/carrier-vetting-batch.md
- `carrier_vetting_score` — Read — https://policylayer.com/tools/io-github-blackboxfoundry-livedatalink/carrier-vetting-score.md
- `caselaw_case_details` — Read — https://policylayer.com/tools/io-github-blackboxfoundry-livedatalink/caselaw-case-details.md
- `caselaw_citation_lookup` — Read — https://policylayer.com/tools/io-github-blackboxfoundry-livedatalink/caselaw-citation-lookup.md
- `caselaw_opinion_text` — Read — https://policylayer.com/tools/io-github-blackboxfoundry-livedatalink/caselaw-opinion-text.md
- `caselaw_search` — Read — https://policylayer.com/tools/io-github-blackboxfoundry-livedatalink/caselaw-search.md
- `cdc_dataset_query` — Read — https://policylayer.com/tools/io-github-blackboxfoundry-livedatalink/cdc-dataset-query.md
- `cdc_drug_overdose_deaths` — Read — https://policylayer.com/tools/io-github-blackboxfoundry-livedatalink/cdc-drug-overdose-deaths.md
- `cdc_excess_deaths_covid` — Read — https://policylayer.com/tools/io-github-blackboxfoundry-livedatalink/cdc-excess-deaths-covid.md
- `cdc_flu_surveillance` — Read — https://policylayer.com/tools/io-github-blackboxfoundry-livedatalink/cdc-flu-surveillance.md
- `cdc_leading_causes_of_death` — Read — https://policylayer.com/tools/io-github-blackboxfoundry-livedatalink/cdc-leading-causes-of-death.md
- …and 259 more: https://policylayer.com/tools/io-github-blackboxfoundry-livedatalink.md

## For agents

This record is a snapshot. Live verdicts and the full registry:

- Check every server in your MCP config at once: `npx -y policylayer stack`
- Vet a server before you add it: install the mcp-precheck skill — `npx skills add https://policylayer.com` (skill text: https://policylayer.com/skill.md)
- Query the registry over MCP: endpoint `https://api.policylayer.com/mcp` — tools `check_mcp_server`, `check_mcp_stack`, `check_tool`, `search_registry`, `get_change_events`

---

Source: the PolicyLayer MCP registry — one continuously verified record per MCP server. Full record: https://policylayer.com/registry?q=io-github-blackboxfoundry-livedatalink · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/io-github-blackboxfoundry-livedatalink