Sunrise & Sunset

Calculate sunrise, sunset, solar noon, and day length for any location and date. Handles polar day and polar night.

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API key

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Latitude

Longitude

Date (YYYY-MM-DD)

Why use this

LLMs can't reliably compute sunrise and sunset times. Use this for scheduling, event planning, astronomical queries, or any agent that needs to know whether it's daylight at a given location.

Input

Field	Type	Required	Description
`lat`	number	✓	Latitude −90 to 90
`lon`	number	✓	Longitude −180 to 180
`date`	string	✓	Date in YYYY-MM-DD format

Response

Field	Type	Description
`sunrise_utc`	string \| null	Sunrise time in HH:MM UTC. Null during polar day or polar night
`sunset_utc`	string \| null	Sunset time in HH:MM UTC. Null during polar day or polar night
`solar_noon_utc`	string	Solar noon in HH:MM UTC — always present
`day_length_hours`	number \| null	Hours of daylight. Null during polar day or polar night
`polar_day`	boolean	True if the sun never sets (Arctic/Antarctic summer)
`polar_night`	boolean	True if the sun never rises (Arctic/Antarctic winter)

API Reference

Endpoint

POST https://api.lightningapi.tools/sunrise-sunset

Required headers

Authorization: Bearer <apiKey>
Content-Type: application/json

Example request

{
  "lat": 53.33,
  "lon": -6.25,
  "date": "2024-06-21"
}

Example response

{
  "sunrise_utc": "03:56",
  "sunset_utc": "21:02",
  "solar_noon_utc": "12:29",
  "day_length_hours": 17.1,
  "polar_day": false,
  "polar_night": false
}