Lune 
Lune.js — calculate the phases of the moon.
Installation
npm install lune
Usage
To calculate current phase information:
var lune = require('lune')
var current_phase = lune.phase()
console.log(current_phase)
Output:
{ phase: 0.3435664924086369,
illuminated: 0.7773055846628978,
age: 10.1457207715498,
distance: 386679.7626047325,
angular_diameter: 0.5150467579643708,
sun_distance: 148929846.0148686,
sun_angular_diameter: 0.5354732715700135 }
To calculate phase information for a specific date:
var lune = require('lune')
var some_date = new Date('2014-02-17T00:00-0500')
var some_date_phase = lune.phase(some_date)
console.log(some_date_phase)
Output:
{ phase: 0.568204641580006,
illuminated: 0.9547862069882863,
age: 16.779417556565985,
distance: 396084.54752883443,
angular_diameter: 0.5028172882344054,
sun_distance: 147822484.14817196,
sun_angular_diameter: 0.5394845874736046 }
To search for recent phases around the current date:
var lune = require('lune')
var recent_phases = lune.phase_hunt()
console.log(recent_phases)
Output:
{ new_date: Tue Mar 08 2016 20:55:59 GMT-0500 (EST),
q1_date: Tue Mar 15 2016 13:04:23 GMT-0400 (EDT),
full_date: Wed Mar 23 2016 08:01:38 GMT-0400 (EDT),
q3_date: Thu Mar 31 2016 11:18:41 GMT-0400 (EDT),
nextnew_date: Thu Apr 07 2016 07:25:20 GMT-0400 (EDT) }
To search for recent phases around a specific date:
var lune = require('lune')
var some_date = new Date('2014-02-17T00:00-0500')
var some_date_phase = lune.phase_hunt(some_date)
console.log(some_date_phase)
Output:
{ new_date: Thu Jan 30 2014 16:40:35 GMT-0500 (EST),
q1_date: Thu Feb 06 2014 14:22:33 GMT-0500 (EST),
full_date: Fri Feb 14 2014 18:54:46 GMT-0500 (EST),
q3_date: Sat Feb 22 2014 12:16:56 GMT-0500 (EST),
nextnew_date: Sat Mar 01 2014 03:02:41 GMT-0500 (EST) }
To search for phases between two dates:
// print all full moons in the first quarter of 2014
var lune = require('lune')
var phase_list = lune.phase_range(
new Date('2014-01-01T00:00:00.000Z'),
new Date('2014-03-31T23:59:59.999Z'),
lune.PHASE_FULL
)
console.log(phase_list)
Possible values for the third argument of the function are:
lune.PHASE_NEW(new moon)lune.PHASE_FIRST(first quarter moon)lune.PHASE_FULL(full moon)lune.PHASE_LAST(third or last quarter moon)
Output:
[ Wed Jan 01 2014 06:15:02 GMT-0500 (EST),
Thu Jan 30 2014 16:40:35 GMT-0500 (EST),
Sat Mar 01 2014 03:02:41 GMT-0500 (EST),
Sun Mar 30 2014 14:48:06 GMT-0400 (EDT) ]
Image
Moon image graciously provided by Mike DiLuigi.
Contributing
Please feel free to contribute to this project! :) Pull requests and feature requests welcome!
License
See LICENSE file in this repo