Sunrise and sunset time calculation for given coordinates. ~1kb minified with zero dependencies.
Calculate sunrise and sunset times in Javascript. Based loosely and indirectly on Kevin Boone's SunTimes Java implementation of the US Naval Observatory's algorithm. Works on both browser (IE11+) and Node.js, ~1kb minified.
Via npm:
npm install --save sunrise-sunset-js
Via script tag:
<script src="sunrise-sunset.js">
import { getSunrise, getSunset } from 'sunrise-sunset-js';
// Or if you use CommonJS imports:
// const { getSunrise, getSunset } = require('sunrise-sunset-js')
/**
* Sunset tonight at the Triggertrap office for today
*/
const sunset = getSunset(51.4541, -2.5920);
/**
* Sunrise at Stonehenge on midsummer's day 2000
*/
const sunrise = getSunrise(51.1788, -1.8262, new Date("2000-06-21"));
/**
* Combined with geolocation. Sunset tonight at your location.
*/
navigator.geolocation.getCurrentPosition(function(position) {
console.log(getSunset(position.coords.latitude, position.coords.longitude));
});
/**
* Get all solar events for given year (sorted by time of occurrence)
*/
function getSolarEventsForYear(latitude, longitude, year) {
const result = [];
const start = new Date(year, 0, 1).getTime();
for (let i = 0; i < 366; i++) {
const d = new Date(start + (i * 24 * 60 * 60 * 1000));
if (d.getFullYear() > year) break; // For non-leap year
result.push(['sunrise', getSunrise(latitude, longitude, d)]);
result.push(['sunset', getSunset(latitude, longitude, d)]);
}
return result.filter(event => Boolean(event[1])).sort((a, b) => a - b);
}
getSolarEventsForYear(51.1788, -1.8262, 2019);
For those who still don't use js bundlers, there's global SunriseSunsetJS object, which exposes the same getSunset and getSunrise methods (must include dist/index.js in your html first)
var sunset = SunriseSunsetJS.getSunset(51.4541, -2.5920);
var sunrise = SunriseSunsetJS.getSunrise(51.4541, -2.5920, new Date("2000-06-21"));
By Matt Kane (@ascorbic). Copyright © 2012 Triggertrap Ltd. All Rights Reserved.
This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. This library is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA, or connect to: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html