If I have a specific time and a latitude measurement in degrees, is there a way to determine the sunrise and sunset times using JavaScript?
If I have a specific time and a latitude measurement in degrees, is there a way to determine the sunrise and sunset times using JavaScript?
For all your sun position calculation needs, SunCalc is the way to go!
SunCalc is a fantastic BSD-licensed JavaScript library that can calculate sun position, sunlight phases (including sunrise, sunset, dusk), moon position, and lunar phase based on location and time.
To find the necessary code, visit
Ensure you have longitude, latitude, and date available. Specify whether you prefer the answer in local time or universal time. The accuracy of the calculations relies heavily on required corrections (and your definitions of "sunrise" and "sunset").
If you're looking for an "approximate" estimate of when the sun is at horizon level based on simple assumptions about Earth's shape, orbital path, and lack of atmospheric influence, the process can be simplified. However, for precise results, be prepared to dissect approximately 600 lines of script from the provided website.
For rough estimations, refer to this previous response
Maximize Your Sun-Time by incorporating JavaScript on the server-side with Node.js.
npm install sun-time ;
After installation, use the following code:
var sun=require('sun-time');
sun('Tunis') // -> i.e : return {rise:"05:00",set:"18:36"}
This unique javascript application
https://github.com/Triggertrap/sun-js
derives sunrise and sunset timings solely based on the latitude and longitude coordinates of your current location, which can be automatically fetched through GPS like this:
<script>
var x = document.getElementById("demo");
function getLocation() {
if (navigator.geolocation) {
navigator.geolocation.getCurrentPosition(showPosition);
} else {
x.innerHTML = "Geolocation is not supported by this browser.";
}
}
function showPosition(position) {
x.innerHTML = "Latitude: " + position.coords.latitude +
"<br>Longitude: " + position.coords.longitude;
}
</script>
It contains a readme guide for usage instructions. The calculations are made at the zenith point and offer high accuracy.
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