Sunrise and Sunset Getting Started: Quickstart Guide (2026)

Getting started overview

Integrating with the Sunrise and Sunset API involves a series of steps to ensure proper access and functionality. This guide focuses on efficiently setting up your environment, acquiring the necessary credentials, and executing a successful initial API request. The Sunrise and Sunset API is designed for straightforward integration, utilizing standard HTTP GET requests and JSON responses.

Before making your first API call, you will need to register for an account on the Sunrise and Sunset website to access API keys. Once registered, you can make requests to retrieve sunrise, sunset, and other twilight times for a given geographical coordinate and date. The API supports a free tier suitable for development and testing, with paid options available for higher usage volumes.

A quick-reference table for the setup process is provided below:

Create an account and get keys

To begin using the Sunrise and Sunset API, the first step is to create an account. This process typically grants you access to an API key, which authenticates your requests and tracks your usage against your chosen plan (free or paid).

1. Navigate to the Signup Page: Go to the official Sunrise and Sunset API documentation page. Look for a "Sign Up" or "Get API Key" button.
2. Complete Registration: Fill out the required registration form. This usually includes your email address and a password. You may need to verify your email address through a confirmation link sent to your inbox.
3. Access Your Dashboard: After successful registration and login, you should be directed to your personal dashboard or account area.
4. Locate Your API Key: Within your dashboard, there will be a section dedicated to API keys or credentials. Your unique API key will be displayed here. It is crucial to treat this key as sensitive information, similar to a password. Do not hardcode it directly into client-side code that could be publicly accessible.
5. Understand Usage Limits: Familiarize yourself with the Sunrise and Sunset pricing summary, particularly the free tier limits (1000 requests/day). Exceeding these limits without a paid plan will result in request failures.

The Sunrise and Sunset API employs a simple API key for authentication, which is often appended as a query parameter in your API requests. This method is distinct from more complex authentication flows like OAuth 2.0, which are common in APIs requiring user consent for data access.

Your first request

After obtaining your API key, you are ready to make your first request. The Sunrise and Sunset API is a RESTful API, meaning you interact with it using standard HTTP methods, primarily GET requests, to retrieve data. The API endpoint for retrieving sunrise and sunset times uses parameters for latitude, longitude, and an optional date.

API Endpoint Structure

The base URL for the API is https://api.sunrise-sunset.org/json?. You append query parameters to this URL.

• lat: Latitude of the location (e.g., 38.9072)
• lng: Longitude of the location (e.g., -77.0369)
• date (optional): Date in YYYY-MM-DD format. If omitted, the current date is used.
• formatted (optional): Set to 0 for unformatted (ISO 8601) times, 1 for formatted times (default).

Example Request (using curl)

Let's retrieve the sunrise and sunset times for Washington, D.C. (latitude 38.9072, longitude -77.0369) for today's date (2026-05-29). Note that the API key is generally not required for the free tier, but it's good practice to be aware of its potential use if you upgrade or if the policy changes.

curl "https://api.sunrise-sunset.org/json?lat=38.9072&lng=-77.0369&date=2026-05-29"

Expected JSON Response

A successful request will return a JSON object containing various twilight times. The exact values will vary based on the date and location. Below is an example structure:

{
  "results": {
    "sunrise": "4:43:24 AM",
    "sunset": "7:28:44 PM",
    "solar_noon": "12:06:04 PM",
    "day_length": "14:45:20",
    "civil_twilight_begin": "4:11:36 AM&nquot;,
    "civil_twilight_end": "8:00:32 PM",
    "nautical_twilight_begin": "3:32:16 AM",
    "nautical_twilight_end": "8:39:52 PM",
    "astronomical_twilight_begin": "2:48:20 AM",
    "astronomical_twilight_end": "9:23:48 PM"
  },
  "status": "OK"
}

The status field indicates the success or failure of the request. A "status": "OK" confirms that the data was retrieved successfully. The results object contains the specific time values.

Using a Programming Language (Python Example)

Here's how you might make the same request using Python's requests library:

import requests
import json

latitude = 38.9072
longitude = -77.0369
date = "2026-05-29"

api_url = f"https://api.sunrise-sunset.org/json?lat={latitude}&lng={longitude}&date={date}"

try:
    response = requests.get(api_url)
    response.raise_for_status()  # Raise an HTTPError for bad responses (4xx or 5xx)
    data = response.json()

    if data["status"] == "OK":
        print("Sunrise:", data["results"]["sunrise"])
        print("Sunset:", data["results"]["sunset"])
        print("Day Length:", data["results"]["day_length"])
    else:
        print("API Error:", data["status"])

except requests.exceptions.RequestException as e:
    print(f"Request failed: {e}")
except json.JSONDecodeError:
    print("Failed to decode JSON response.")

This Python script demonstrates how to construct the URL, send the GET request, and parse the JSON response. Error handling is included to manage potential network issues or invalid API responses, which is a critical aspect of robust API client design.

Common next steps

Once you have successfully made your first API call to the Sunrise and Sunset API, consider these common next steps to further integrate and optimize your usage:

1. Dynamic Date and Location Inputs: Instead of hardcoding latitude, longitude, and date, implement dynamic inputs. For example, allow users to input a location or retrieve their current coordinates using a geocoding API like Google Maps Geocoding API to provide real-time, localized data.
2. Error Handling and Edge Cases: Expand your error handling to gracefully manage all possible API responses, including network errors, invalid parameters, and API rate limit exceeded messages. Consider edge cases like polar regions where the sun may not rise or set for extended periods.
3. Data Storage and Caching: For applications that frequently request the same location and date data, implement caching mechanisms. Since sunrise/sunset times for a given date and location are static, storing these results locally after the first fetch can significantly reduce API calls and improve performance, adhering to the HTTP caching standards in RFC 7234.
4. User Interface Integration: Display the retrieved data in a user-friendly format within your application. This might involve converting the times to a user's local timezone or presenting them visually.
5. Advanced Time Calculations: Explore the other twilight fields (civil, nautical, astronomical twilight) provided by the API. These can be useful for specific applications like celestial navigation, astrophotography planning, or defining different phases of dawn and dusk.
6. Rate Limit Monitoring: If your application anticipates high usage, monitor your API request volume. Consider upgrading your plan on the Sunrise and Sunset pricing page if you approach the free tier limits to avoid service interruptions.
7. Security Best Practices: Ensure your API key (if required for higher tiers or future changes) is securely stored and transmitted. Avoid exposing it in client-side code or public repositories.

Troubleshooting the first call

Encountering issues during your first API call is common. Here are some troubleshooting steps and common problems you might face when interacting with the Sunrise and Sunset API:

• Incorrect URL or Parameters:
  • Issue: The API returns a 400 Bad Request error or unexpected data.
  • Solution: Double-check the URL for typos. Ensure that lat, lng, and date parameters are correctly formatted and present. Latitude should be between -90 and +90, and longitude between -180 and +180. Dates should be in YYYY-MM-DD format. Refer to the Sunrise and Sunset API documentation for exact parameter requirements.
• Network Connectivity Issues:
  • Issue: Your request times out or a connection error occurs.
  • Solution: Verify your internet connection. If you are behind a firewall or proxy, ensure that outbound connections to api.sunrise-sunset.org are permitted.
• JSON Parsing Errors:
  • Issue: Your application fails to parse the JSON response.
  • Solution: Inspect the raw response from the API. Sometimes, errors from the API itself might not return valid JSON, or the JSON structure might be different than expected in error cases. Ensure your JSON parser is robust enough to handle various response structures.
• API Rate Limits Exceeded:
  • Issue: The API returns an error indicating that you've made too many requests.
  • Solution: The free tier is limited to 1000 requests per day. Check your request count. If you need higher limits, consider upgrading your plan on the Sunrise and Sunset pricing page. Implement client-side rate limiting or caching to manage your request volume.
• Time Zone Discrepancies:
  • Issue: The returned times do not match local observations.
  • Solution: The API returns times in UTC by default, but the formatted=1 parameter (default) returns local times. If you need specific time zone handling, you may need to apply a time zone conversion in your application using a library like pytz in Python or moment-timezone.js in JavaScript, often in conjunction with a timezone API like ArcGIS Find Time Zone.
• No Data for Extreme Latitudes:
  • Issue: For locations very close to the poles, the API might return "No sunrise or sunset for this date" or similar messages.
  • Solution: This is expected behavior for regions experiencing polar day or night. Your application should be designed to handle these specific messages gracefully.