Sunrise Sunset

Free REST API providing sunrise, sunset, solar noon, day length, and civil, nautical, and astronomical twilight times for any geographic location and date. No API key or account required; attribution to sunrise-sunset.org is required. A single GET request to https://api.sunrise-sunset.org/json with a latitude, longitude, and optional date returns all solar time data for that location.

Sunrise Sunset publishes 1 API contract indexed on the APIs.io network: Json API. Tagged areas include Sunrise, Sunset, Solar, Astronomy, and Twilight.

The Sunrise Sunset catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

Sunrise Sunset’s developer surface includes documentation and 14 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

31.1/100 thin ▬ flat Agent 39/100 agent ready Front door AI 1/6 silent saas Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

AccessFreeOpen⚡ Free to try

1 published contract 1 MCP Servers

Sunrise Sunset Solar AstronomyTwilightWeather Geolocation Free

Kin Score

Kin Score How this is scored →
scored 2026-11-13 · rubric v0.28.0

Composite quality — 31.1/100 · thin

Contract Quality 10.9 / 21

Developer Ergonomics 1.6 / 17

Access Clarity 5.8 / 17

Operational Transparency 1.6 / 11

Contract Governance 1.0 / 10

Discoverability 5.8 / 9

Regulatory Posture 1.9 / 15

Agent readiness — 39/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 6 / 6

MCP Server 12 / 12

Machine-Readable Auth 0 / 10

Idempotency 9 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 4 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics does not apply to this provider. The published contracts declare no write operations, and a read-only API cannot create-or-update. The facet is excluded from this provider's denominator entirely — not scored zero. A reference or data API is not deficient for being unable to upsert.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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Agent readiness — checks not met, largest first (exact, from this profile):

Machine-Readable Auth +10 pts — a served openid-configuration/oauth-authorization-server carrying `issuer` (served), else the securitySchemes class in the provider OpenAPIs — bound (mutualTLS, DPoP, Signature) > negotiable (oauth2 authorizationCode/clientCredentials, openIdConnect) > bearer (http bearer, apiKey) Ask about this →
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes Ask about this →
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0 Ask about this →
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document Ask about this →
Delegated User Identity +6 pts — a served discovery document listing authorization_code in grant_types_supported (served), else an oauth2 authorizationCode flow or openIdConnect declared in an OpenAPI (documented) Ask about this →
Typed Event Surface +6 pts — AsyncAPI document, OR webhooks/callbacks objects in the as-published OpenAPI, OR common[].type includes Webhooks Ask about this →

5 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Developer Ergonomics scores 9.5 — up to +18.1 composite points Ask about this →
Access Clarity scores 34.0 — up to +13.2 composite points Ask about this →
Contract Quality scores 51.4 — up to +12.2 composite points Ask about this →

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

Not sure how this applies to your stack? Ask about any one item. Kin Lane reads every question, looks at your profile and your situation, and replies with what a fix would take — scoped to that one area, priced up front, yours whether you ship it or not. Ask a question →

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from the provider profile at artifacts.apis.io/sunrise-sunset/apis.yml: open an issue on github.com/api-evangelist/sunrise-sunset to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Standards implemented 2

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

Model Context Protocol (MCP)

measured — observed by APIs.io (verified)

OpenAPI

measured — observed by APIs.io (published)

APIs 1

Individual APIs this provider publishes, each with its own machine-readable definition.

Sunrise Sunset Json API

The Json API from Sunrise Sunset — 1 operation(s) for json.

Open Collections 1

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

Sunrise Sunset Json API

OPEN COLLECTION

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

Sunrise Sunset MCP Server

Remote MCP server at api.sunrise-sunset.org over HTTP; 2 tools listed.

MCP SERVER

Sunrise Sunset API pricing

Not yet checked against Sunrise Sunset's own pricing page. Compiled by API Evangelist; confirm before you rely on a figure. A free plan or tier is listed.

Plan	Price
Free	Free

Plan details, limits and sources →

Pricing Plans 1

Published pricing tiers and plan structures.

Sunrise Sunset Plans Pricing

1 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Sunrise Sunset Rate Limits

0 limits

RATE LIMITS

Terms of Service 1

What its API terms permit and prohibit, quoted from its own page.

Sunrise Sunset

3 quoted statements, read from Sunrise Sunset's own page on 2026-11-10.

TERMS

Privacy & Data 1

Its role, the data it processes, retention and transfers, quoted from its own privacy page.

Sunrise Sunset

9 quoted statements, read from Sunrise Sunset's own page on 2026-11-10.

PRIVACY

Eligibility 1

Who may sign up and where, quoted from its own terms.

Sunrise Sunset

1 quoted statement, read from Sunrise Sunset's own page on 2026-11-10.

ELIGIBILITY

AI Preferences 1

Its stance on AI training, inference and agents, quoted from its own pages.

Sunrise Sunset

1 quoted statement, read from Sunrise Sunset's own page on 2026-11-10.

AI PREFS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Sunrise Sunset Finops

FINOPS

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Sunrise Sunset Context

2 classes · 16 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs. Counts are the severity each rule declares, not results of running them.

Sunrise Sunset — jsonschema rules

5 rules · 4 warn-severity 1 info-severity

SPECTRAL

JSON Schema 1

Standalone JSON Schema definitions for this provider's data models.

SolarTimesResponse

3 properties

JSON SCHEMA

Examples 2

Example request and response payloads for these APIs.

Get Solar Times Formatted

4 fields

EXAMPLE

Get Solar Times Iso8601

4 fields

EXAMPLE

Security Posture 1

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Sunrise Sunset Domain Security

TLSv1.3

SECURITY

Agentic Access (API Evangelist recommendations) 1

Recommended x-agentic-access execution contracts for AI agents.

Sunrise Sunset Agentic Access

1 operation

1 operations · 0 acting

AGENTIC

Resources

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

AIPreferences

AIPreferences

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Operate 3

Status, limits, changes, and where to get help

StatusPage

StatusPage

RateLimits

RateLimits

Contact

Contact

Commercial 5

Pricing, plans, and the legal terms of use

Plans

FinOps

TermsOfService

PrivacyPolicy

UsageTerms

Company 1

The organization behind the API

Website

Website

Other 2

Properties that don't map to a standard resource type

DataProcessing

DataProcessing

Eligibility

Eligibility

Source (apis.yml)

aid: sunrise-sunset
name: Sunrise Sunset
description: 'Free REST API providing sunrise, sunset, solar noon, day length, and civil, nautical, and astronomical twilight
  times for any geographic location and date. No API key or account required; attribution to sunrise-sunset.org is required.
  A single GET request to https://api.sunrise-sunset.org/json with a latitude, longitude, and optional date returns all solar
  time data for that location.

  '
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: high
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: free
  onboarding: open
  trial: false
  try_now: true
  public: true
  gated: none
  gated_source:
  - onboarding
  label: Free · Open access
  confidence: low
  source:
  - plans
  - security
  generated: '2026-11-13'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/sunrise-sunset.png
url: https://raw.githubusercontent.com/api-evangelist/sunrise-sunset/refs/heads/main/apis.yml
created: '2026-06-13'
modified: '2026-06-13'
specificationVersion: '0.23'
type: Index
tags:
- Sunrise
- Sunset
- Solar
- Astronomy
- Twilight
- Weather
- Geolocation
- Free
apis:
- aid: sunrise-sunset:sunrise-sunset-json-api
  name: Sunrise Sunset Json API
  description: The Json API from Sunrise Sunset — 1 operation(s) for json.
  humanURL: https://sunrise-sunset.org/api
  baseURL: https://api.sunrise-sunset.org
  tags:
  - JSON
  tags_raw:
  - Json
  properties:
  - type: OpenAPI
    url: openapi/sunrise-sunset-json-api-openapi.yml
  - type: Documentation
    url: https://sunrise-sunset.org/api
common:
- type: AgenticAccess
  url: agentic-access/sunrise-sunset-agentic-access.yml
- type: DomainSecurity
  url: security/sunrise-sunset-domain-security.yml
- type: Website
  url: https://sunrise-sunset.org/
- type: Documentation
  url: https://sunrise-sunset.org/api
- type: StatusPage
  url: https://apistatus.sunrise-sunset.org/
- type: Plans
  url: https://raw.githubusercontent.com/api-evangelist/sunrise-sunset/refs/heads/main/plans/sunrise-sunset-plans-pricing.yml
- type: RateLimits
  url: https://raw.githubusercontent.com/api-evangelist/sunrise-sunset/refs/heads/main/rate-limits/sunrise-sunset-rate-limits.yml
- type: FinOps
  url: https://raw.githubusercontent.com/api-evangelist/sunrise-sunset/refs/heads/main/finops/sunrise-sunset-finops.yml
- type: TermsOfService
  url: https://sunrise-sunset.org/terms
- type: PrivacyPolicy
  url: https://sunrise-sunset.org/privacy
- type: Contact
  url: https://sunrise-sunset.org/contact
- type: UsageTerms
  url: terms/sunrise-sunset-terms-of-service.yml
- type: DataProcessing
  url: privacy/sunrise-sunset-privacy-policy.yml
- type: Eligibility
  url: eligibility/sunrise-sunset-eligibility.yml
- type: AIPreferences
  url: ai-preferences/sunrise-sunset-ai-preferences.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

Sunrise Sunset API — frequently asked questions

Does Sunrise Sunset have an API?

Yes. APIs.io lists 1 API from Sunrise Sunset, including Sunrise Sunset Json API.

Is there an OpenAPI specification for the Sunrise Sunset API?

Yes. APIs.io indexes 1 OpenAPI specification for Sunrise Sunset, each linked for download from this page.

How much does the Sunrise Sunset API cost?

APIs.io lists 1 pricing plan for Sunrise Sunset, with each plan's price, limits and inclusions under Pricing on this page.

Does Sunrise Sunset have an MCP server?

Yes. APIs.io lists 1 MCP server for Sunrise Sunset: Remote MCP server at api.sunrise-sunset.org over HTTP; 2 tools listed.

Is the Sunrise Sunset API ready for AI agents?

Sunrise Sunset has a Kin Score of 31.1 out of 100 (thin) and an Agent Readiness score of 38.9 (agent-ready), scored by API Evangelist on 2026-11-13.

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