celestial-sun

A Javascript library to calculate sun events.

• Avoid JS Date gymnastics.
• Date and time I/O are treated numbers-only.
• Use your favorite Date library on the side.

Currently supported:

• Sunrise
• Sunset
• Solar noon

Install / Use

View the test file for a complete example.

https://www.npmjs.com/package/celestial-sun

const sun = require('./celestial-sun');

let sunEvents = sun.calculate(latitude, longitude, year, month, day, utcOffset);

let sunrise = sunEvents.sunrise;
let sunset = sunEvents.sunset;
let solarnoon = sunEvents.solarnoon;

//example use with local JS Date

console.log(new Date(sunrise.year, sunrise.month, sunrise.day, sunrise.hour, sunrise.minutes, sunrise.seconds));

//Note: Using JS Date object, date appear correct only for systems in the given latitude/longtitude.

Contribute

If you'd like to contribute please create a Pull Request including test code.

Disclaimer:

• This code is ported to JS from C# Fiddle 'SolarCalc NOAA' https://dotnetfiddle.net/N3j5th by Erik Murphy