Sun calculation js library which is fully based on formula from http://aa.quae.nl/en/reken/zonpositie.html
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const a = require('./lib/solar-calculation');
let b = new a();
let lat = 3.597031;
let long = 98.678513;
function JDtoDate(jd) {
let d = new Date((jd + 0.5 - 2440588) * (1000 * 60 * 60 * 24))
console.log(d);
return d.toString();
}
let sff = b.getSunInformation(new Date(), 3.597031, 98.678513)
console.log(sff.clientJD)
console.log(JDtoDate(sff.sunset));
console.log(sff)