Lune
Lune.js is a JavaScript library for calculating the phases of the moon. It can calculate the phase of the moon for any date, as well as the note-worthy phases around a given date.
Example
To calculate current phase information:var lune = require('lune');
var current_phase = lune.phase();
console.log(current_phase);
Output:
{
phase: 0.5358014231208499,
illuminated: 0.9874029678753915,
age: 15.822531440340462,
distance: 399704.2447849964,
angular_diameter: 0.4982638055473454,
sun_distance: 147790721.2629182,
sun_angular_diameter: 0.539600532418603
}You can check it out on GitHub here.
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